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This removes unnecessary PDF dependencies from component_extension_resources.grd and browser_resources.grd.
These particular files get flattened into the HTML and so are not needed in the
grd files. 

BUG=363909

Review URL: https://codereview.chromium.org/251813008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266844 0039d316-1c4b-4281-b951-d872f2087c98