Move webkit resources over to content.
And while I'm at it, change the includes to use the qualified path for
the grit generated header file
($gen_dir/content/app/resources/grit/content_resources.h).
BUG=338338
TEST=None
R=avi@chromium.org,jamesr@chromium.org,thestig@chromium.org,tony@chromium.org
TBR=darin@chromium.org
Review URL: https://codereview.chromium.org/
486573002
Cr-Commit-Position: refs/heads/master@{#291369}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291369 0039d316-1c4b-4281-b951-d872f2087c98