Convert View::HasFocus() to be const.  Required adding const versions of some accessors which in turn prompted me to make some uses of these accessors be a bit more const-correct.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/8393024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107403 0039d316-1c4b-4281-b951-d872f2087c98
54 files changed