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As soon as we start to handle an event, filter against the type of
nodes we care about (only text fields), rather than waiting to filter
in DidHandleMouseEvent().

Otherwise, PageClickTracker could hold a reference to the node until the
next mouse event, potentially keeping the node alive for longer than
necessary.

Review URL: http://codereview.chromium.org/7064012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86759 0039d316-1c4b-4281-b951-d872f2087c98