Move LinkDoctor out of content and into chrome.
This is in preparation for using the new LinkDoctor API.

BUG=308232
R=darin@chromium.org, tsepez@chromium.org, ttuttle@chromium.org

Review URL: https://codereview.chromium.org/67283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244611 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244611
Revert 244584 "Add simple unit test for keyboard container anima..."

> Add simple unit test for keyboard container animation
> 
> 
> BUG=333889
> 
> Review URL: https://codereview.chromium.org/131833005

TBR=bshe@chromium.org

Review URL: https://codereview.chromium.org/137593002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244612 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244612