Enable FileSystemAccessLocal for android

Android implementation is complete.
go/android-filesystem-api-design
launch/4341240

WebView has ongoing work to update WebChromeClient.FileChooserParams
to make it clearer when files are being requested via the FSA API
for editing such as window.showOpenFilePicker() vs other sources such
as input-file, but it is still currently possible to use with
WebChromeClient#onShowFileChooser().

Bug: 40101963
Change-Id: Ib499127c25d131d5cfa782662739ee45832ce82f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5832590
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1374181}

android_webview/tools/system_webview_shell/test/data/webexposed/not-webview-exposed.txt

@@ -102,10 +102,6 @@ interface EyeDropper
 interface HTMLInputElement : HTMLElement
     getter webkitEntries
 
-# File System Access API not supported on Android, crbug.com/1011535
-interface DataTransferItem
-    method getAsFileSystemHandle
-
 interface MediaDevices : EventTarget
     method getDisplayMedia
     method setCaptureHandleConfig
@@ -251,9 +247,6 @@ interface DocumentPictureInPictureEvent : Event
     method getDigitalGoodsService            # Digital Goods API, crbug.com/1312827
     method webkitRequestFileSystem           # File System API, crbug.com/589843
     method webkitResolveLocalFileSystemURL   # File System API, crbug.com/589843
-    method showOpenFilePicker                # File System Access API, crbug.com/1011535
-    method showSaveFilePicker                # File System Access API, crbug.com/1011535
-    method showDirectoryPicker               # File System Access API, crbug.com/1011535
     method queryLocalFonts                   # Local Font Access API, crbug.com/1326898
     getter sharedStorage                     # Shared storage API
     getter fence                             # Fenced frames API

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1962,7 +1962,7 @@
     {
       // Non-OPFS File System Access API.
       name: "FileSystemAccessLocal",
-      status: {"Android": "test", "default": "stable"},
+      status: {"default": "stable"},
     },
     {
       name: "FileSystemAccessLockingScheme",