Refactoring: execute, isEnabled, state, value functions of EditorInternalCommand class should take a Frame reference argument.
Refactoring: execute, isEnabled, state, value functions of EditorInternalCommand class should take a Frame reference argument.

They are always non-null. On the other hand, the frame argument of
isSupportedFromDOM can be null.

BUG=none
TEST=none; no behavior changes.

Review URL: https://chromiumcodereview.appspot.com/23532002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@156805 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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