Revert 248455 "Disable two flaky WebRTC tests on Linux."

These flakes were likely due to the bots being out of memory.

> Disable two flaky WebRTC tests on Linux.
> 
> There are three tests failing in the bug. Starting with disabling these two.
> 
> TBR=fischman@chromium.org
> BUG=340197
> 
> Review URL: https://codereview.chromium.org/144903003

TBR=grunell@chromium.org

Review URL: https://codereview.chromium.org/200383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257109 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 257109
Media Galleries: Properly retrieve file names on MTP devices on Windows.

BUG=348981
TEST=Media galleries apps work correctly with iOS devices. Media galleries apps show correct file names on Android devices.

Review URL: https://codereview.chromium.org/195813008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257110 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 257110