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We shouldn't do find-in-page while a IME is composing.  This CL delays the actual search until the IME composition is committed.

BUG=158911
TEST=Test manually.

Review URL: https://chromiumcodereview.appspot.com/15841009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203936 0039d316-1c4b-4281-b951-d872f2087c98