Revert 251425 "Valgrind: Disable failing test: InputMethodManage..."

> Valgrind: Disable failing test: InputMethodManagerImplTest.TestEnableLayoutsAndCurrentInputMethod.
> 
> BUG=344008
> NOTRY=true
> TBR=groby@chromium.org
> 
> Review URL: https://codereview.chromium.org/167383004

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/167853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251438 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251438