Get rid of another bunch of tab_contents.h includes from chrome and switch the code to use WebContents.

BUG=98716
TBR=erg
Review URL: http://codereview.chromium.org/9110003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116466 0039d316-1c4b-4281-b951-d872f2087c98
105 files changed