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Move web_contents_unittest.cc to content, where it belongs next to TabContents. Also rename it to tab_contents_unittests.cc. I've moved the one part that depended on PrefService to the pref service test.

BUG=98716
Review URL: http://codereview.chromium.org/8802024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113367 0039d316-1c4b-4281-b951-d872f2087c98