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For impl-side painting, page scales are directly applied to cc.
As a result, we are no longer using old style css based page scale transforms.
Revert all the changes we made in https://codereview.chromium.org/11359200/ as this is no longer needed

BUG=175121

Review URL: https://codereview.chromium.org/12218122

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182076 0039d316-1c4b-4281-b951-d872f2087c98