Add a dummy implementation of a new WebWidget::confirmComposition() method.
Add a dummy implementation of a new WebWidget::confirmComposition() method.

In order to fix https://bugs.webkit.org/show_bug.cgi?id=51693, I'm going
to add following new method into WebKit::WebWidget interface:

bool confirmComposition(const WebString& text) = 0;

As PepperWidget implements WebKit::WebWidget interface directly, we need
to add a dummy implementation of this new method into PepperWidget
first to prevent chromium build from being broken.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/5984006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@70289 0039d316-1c4b-4281-b951-d872f2087c98

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