Stop running the WebGL conformance tests through the content_browsertests harness.

Intermittent crashes of this harness while running these tests are the
top source of flakiness on the GPU bots. These tests are now running
through Telemetry with better reliability.

BUG=225939
R=piman@chromium.org, zmo@chromium.org

Review URL: https://codereview.chromium.org/26344005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227951 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227951
Pepper: Remove PPB_FileIOTrusted.

After migrating FileDownloader to PPB_FileIO_Private, there should be no users of PPB_FileIOTrusted remaining.

This removes a use of the GetOSFileDescriptor method in the URLLoader tests. I had tried moving this over to RequestOSFileHandle, but repeatedly ran into quota problems (maybe with how the test is set up?). Regardless, I don't think we need coverage there since that's tested in the FileIO tests anyway.

R=dmichael@chromium.org, sbc@chromium.org
TBR=cpu, jschuh, sbc
BUG=246396

Review URL: https://codereview.chromium.org/26473004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227952 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227952