Removed mtune for Android build.

mtune was set to cortex-a8, which is a Nexus S-generation CPU.
Removing it allows for small speed improvements (~1%) for
warm page load times on top10 mobile sites on more recent devices.
Data: https://docs.google.com/spreadsheet/ccc?key=0Ao-xIDuezqMNdDc5OWpxbkk4NFJ0SF9Iemt0Tlg3RFE&usp=sharing
And it has virtually no effect on binary size.
BUG=334271

Review URL: https://codereview.chromium.org/145663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247882 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247882
Files.app: Ignore FILE_ERROR_ABORT error when sync update.

Previously FILE_ERROR_ABORT that is happened by user's cancel operations raises
the general error message.

BUG=339028
TEST=manually

Review URL: https://codereview.chromium.org/149243005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247883 0039d316-1c4b-4281-b951-d872f2087c98
Enable media android tests and make --disable-gesture-requirement-for-media-playback default for media measurement.

Android cases exclude 4k and 50fps content.

BUG=329691

Review URL: https://codereview.chromium.org/149793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247884 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247883
SVN changes up to revision 247884
[SyncFS] Add ScopedEnableSyncFSV2 for testing

Add the class to temporarily enable SyncFSV2 for testing.

BUG=331988
R=kinuko@chromium.org

Review URL: https://codereview.chromium.org/130913013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247885 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247885