Revert of Revert of Use BoringSSL in the implementation of ClearKey f…

…or Chromecast. (patchset #1 id:1 of https://codereview.chromium.org/1141243003/)

Reason for revert:
OK to replay now

Original issue's description:
> Revert of Use BoringSSL in the implementation of ClearKey for Chromecast. (patchset #1 id:1 of https://codereview.chromium.org/1130893008/)
>
> Reason for revert:
> Temporary revert until Monday (blocked on some other internal changes).
>
> Original issue's description:
> > Use BoringSSL in the implementation of ClearKey for Chromecast.
> > (Previously, this was used only with the "Chrome" branding).
> >
> > BUG= 488572
> >
> > R=gunsch@chromium.org
> >
> > Committed: https://crrev.com/defd2af08f3753687cb2d86b34bbec9da31ccbab
> > Cr-Commit-Position: refs/heads/master@{#330156}
>
> TBR=ddorwin@chromium.org,dougsteed@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG= 488572
>
> Committed: https://crrev.com/564d81833f28f73b9413c6d01725530ff91de64c
> Cr-Commit-Position: refs/heads/master@{#330230}

TBR=ddorwin@chromium.org,dougsteed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG= 488572

Review URL: https://codereview.chromium.org/1148433002

Cr-Commit-Position: refs/heads/master@{#330372}

chromecast/media/media.gyp

@@ -195,17 +195,7 @@
         '../../base/base.gyp:base',
         '../../crypto/crypto.gyp:crypto',
         '../../media/media.gyp:media',
-      ],
-      'conditions': [
-        ['chromecast_branding=="Chrome"', {
-          'dependencies': [
-            '../internal/cast_system.gyp:openssl',
-          ],
-        }, {
-          'dependencies': [
-            '../../third_party/boringssl/boringssl.gyp:boringssl',
-          ],
-        }],
+        '../../third_party/boringssl/boringssl.gyp:boringssl',
       ],
       'sources': [
         'cma/pipeline/audio_pipeline.cc',