Update selected range after truncation
   
Update |SourceBufferStream::selected_range_| after |TruncateAt| is called in case the range pointed to by it gets deleted.

There are situations where next_buffer_index_ remains at -1 
where|ChunkDemuxer::AppendData| is invoked. This eventually
causes crash. This changes prevents such cases.

The crash is occasionally observed when YouTube MSE/EME
conformance test http://yt-dash-mse-test.commondatastorage.googleapis.com/unit-tests/tot.html
(41.MediaSourceDuration) is done on Android TV device.

BUG=313102

Review URL: https://codereview.chromium.org/51983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233468 0039d316-1c4b-4281-b951-d872f2087c98
<webview>: Cleanup tests

Different <webview> browser tests had different success/failure messages.

This change makes them all the same and simplifies matters.

BUG=none
TBR=fsamuel@chromium.org

Review URL: https://codereview.chromium.org/60273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233469 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233468
net: disable ChaCha20 based cipher suites.

We're not ready for this in M32:
  * The Windows compiler doesn't support vector code so we're using generic
    code there.
  * We don't have promotion for AES-GCM ciphersuites when AES-NI is supported.

This change is designed to be reverted on trunk once M32 has branched.

BUG=315791

Review URL: https://codereview.chromium.org/60353005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233470 0039d316-1c4b-4281-b951-d872f2087c98
Suppress configure dialog when screen is locked

BUG=314263

Review URL: https://codereview.chromium.org/60553004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233471 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233470
SVN changes up to revision 233471