aura: Remove Window::SetHitTestBoundsOverrideOuter() and related methods.

Event-targeters (e.g. wm::EasyResizeWindowTargeter) now do the necessary work
for allowing a window to receive events outside of its bounds. So these methods
on aura::Window are no longer necessary.

BUG=318879
R=ben@chromium.org

Review URL: https://codereview.chromium.org/133873004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247821 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247821
Revert 247760 "Add UMA stats for ExtensionCache"

> Add UMA stats for ExtensionCache
> 
> Reported metrics:
> - number of extensions in cache
> - size of cache on disk
> 
> BUG=316371
> TEST=manual
> 
> Review URL: https://codereview.chromium.org/148013004

This causes compile failures on ChromeOS. See comments on original CL for
details.
TBR=dpolukhin@chromium.org

Review URL: https://codereview.chromium.org/139173009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247822 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247822