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think this was happening because we were injecting from the the
browser at load_start, but the document might not be established
in the renderer by the time this message is received.

Since we are now not even showing the toolstrip until
load_complete, it is no big deal to delay the CSS injection
until then.

Review URL: http://codereview.chromium.org/100182

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14914 0039d316-1c4b-4281-b951-d872f2087c98