Fix unit_tests build on Fedora 20.

BUG=305074

Review URL: https://codereview.chromium.org/26432002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227701 0039d316-1c4b-4281-b951-d872f2087c98
Removed NULL checks for operator new() return value.

BUG=271530

Review URL: https://codereview.chromium.org/26570005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227702 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227702
Use screen work_area to calculate keyboard overlay size

BUG=305271
TEST=ash_unittests --gtest_filter=*KeyboardOverlayDelegateTest*
TEST=Visual - follow bug repro steps

Review URL: https://codereview.chromium.org/26587005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227703 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227703