Remove // ignore: unsafe_html.

Closes dart-lang/sdk#50203

TEST=N/A



GitOrigin-RevId: dbdc7a784d4fabd750f305f99f138b6bc53407bf
Change-Id: Ia89f24217b4e210bb2503b624e74cf7c351ad039
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/264140
Commit-Queue: Michael Thomsen <mit@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>

Author: vrana

runtime/observatory/lib/src/elements/heap_snapshot.dart

@@ -603,7 +603,6 @@ class HeapSnapshotElement extends CustomElement implements Renderable {
     var blob = new Blob(_snapshotA!.chunks, 'application/octet-stream');
     var blobUrl = Url.createObjectUrl(blob);
     var link = new AnchorElement();
-    // ignore: unsafe_html
     link.href = blobUrl;
     var now = new DateTime.now();
     link.download = 'dart-heap-${now.year}-${now.month}-${now.day}.bin';

runtime/observatory/lib/src/elements/process_snapshot.dart

@@ -298,7 +298,6 @@ class ProcessSnapshotElement extends CustomElement implements Renderable {
     var blob = new Blob([jsonEncode(_snapshotA)], 'application/json');
     var blobUrl = Url.createObjectUrl(blob);
     var link = new AnchorElement();
-    // ignore: unsafe_html
     link.href = blobUrl;
     var now = new DateTime.now();
     link.download = 'dart-process-${now.year}-${now.month}-${now.day}.json';

runtime/observatory/lib/src/elements/timeline_page.dart

@@ -185,7 +185,6 @@ class TimelinePageElement extends CustomElement implements Renderable {
                 "This VM is forwarding timeline events to Fuchsia's system tracing. See the ",
           new AnchorElement()
             ..text = "Fuchsia Tracing Usage Guide"
-            // ignore: unsafe_html
             ..href = "https://fuchsia.dev/fuchsia-src/development/tracing",
           new SpanElement()..text = ".",
         ];
@@ -201,7 +200,6 @@ class TimelinePageElement extends CustomElement implements Renderable {
                 "This VM is forwarding timeline events to Android's systrace. See the ",
           new AnchorElement()
             ..text = "systrace usage guide"
-            // ignore: unsafe_html
             ..href =
                 "https://developer.android.com/studio/command-line/systrace",
           new SpanElement()..text = ".",
@@ -219,7 +217,6 @@ class TimelinePageElement extends CustomElement implements Renderable {
                     "To track these events, open 'Instruments' and add the 'os_signpost' Filter. See the ",
           new AnchorElement()
             ..text = "Instruments Usage Guide"
-            // ignore: unsafe_html
             ..href = "https://help.apple.com/instruments",
           new SpanElement()..text = ".",
         ];

runtime/observatory_2/lib/src/elements/heap_snapshot.dart

@@ -642,7 +642,6 @@ class HeapSnapshotElement extends CustomElement implements Renderable {
     var blob = new Blob(_snapshotA.chunks, 'application/octet-stream');
     var blobUrl = Url.createObjectUrl(blob);
     var link = new AnchorElement();
-    // ignore: unsafe_html
     link.href = blobUrl;
     var now = new DateTime.now();
     link.download = 'dart-heap-${now.year}-${now.month}-${now.day}.bin';

runtime/observatory_2/lib/src/elements/process_snapshot.dart

@@ -134,7 +134,6 @@ class ProcessSnapshotElement extends CustomElement implements Renderable {
     var blob = new Blob([jsonEncode(_snapshotA)], 'application/json');
     var blobUrl = Url.createObjectUrl(blob);
     var link = new AnchorElement();
-    // ignore: unsafe_html
     link.href = blobUrl;
     var now = new DateTime.now();
     link.download = 'dart-process-${now.year}-${now.month}-${now.day}.json';

runtime/observatory_2/lib/src/elements/timeline/dashboard.dart

@@ -91,7 +91,6 @@ class TimelineDashboardElement extends CustomElement implements Renderable {
     if (_content == null) {
       _content = new DivElement()..classes = ['content-centered-big'];
     }
-    // ignore: unsafe_html
     _frame.src = _makeFrameUrl();
     _content.children = <Element>[
       new HeadingElement.h2()

runtime/observatory_2/lib/src/elements/timeline_page.dart

@@ -184,7 +184,6 @@ class TimelinePageElement extends CustomElement implements Renderable {
                 "This VM is forwarding timeline events to Fuchsia's system tracing. See the ",
           new AnchorElement()
             ..text = "Fuchsia Tracing Usage Guide"
-            // ignore: unsafe_html
             ..href = "https://fuchsia.dev/fuchsia-src/development/tracing",
           new SpanElement()..text = ".",
         ];
@@ -200,7 +199,6 @@ class TimelinePageElement extends CustomElement implements Renderable {
                 "This VM is forwarding timeline events to Android's systrace. See the ",
           new AnchorElement()
             ..text = "systrace usage guide"
-            // ignore: unsafe_html
             ..href =
                 "https://developer.android.com/studio/command-line/systrace",
           new SpanElement()..text = ".",
@@ -218,7 +216,6 @@ class TimelinePageElement extends CustomElement implements Renderable {
                     "To track these events, open 'Instruments' and add the 'os_signpost' Filter. See the ",
           new AnchorElement()
             ..text = "Instruments Usage Guide"
-            // ignore: unsafe_html
             ..href = "https://help.apple.com/instruments",
           new SpanElement()..text = ".",
         ];