Revert 171737 - linux_chrome_clang buildbot is broken

http://build.chromium.org/p/chromium.chromiumos/buildstatus?builder=Linux%20ChromiumOS%20%28Clang%20dbg%29&number=25562

> Force mirror mode to preserve aspect ratio, use panel fitting when possible.
> 
> Previously, the resolution chosen for mirror mode would be
> the highest common resolution among the internal and external displays.
> This would often fall back to the 1024x768 case,
> which looks bad on wide displays and internal panels.
> 
> Now, only external display resolutions with display's native aspect ratio
> will be considered for mirror mode.
> 
> This will often end up in "can't mirror",
> so this commit also enables panel fitting on SNB,
> which will try to panel fit external display's resolution on internal panel,
> even if the panel didn't advertise support for this resolution.
> 
> In case of 2 external monitors, mirror mode will try to find
> a common resolution which will preserve aspect ratio on at least one of them.
> 
> For now, panel fitting is used only on internal panels.
> In the future it may be feasible to support it on external displays as well,
> which will allow us to always enter mirror mode,
> providing that GPU has panel fitter.
> 
> BUG=chrome-os-partner:16384
> TEST=For the displays in bug report, mirror mode resolution is 1280x720.
> 
> 
> Review URL: https://chromiumcodereview.appspot.com/11411304

TBR=ynovikov@chromium.org
Review URL: https://codereview.chromium.org/11474020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171750 0039d316-1c4b-4281-b951-d872f2087c98

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