Fixed bug where DomMutationObserver failed to notice changes to only character data.

BUG=None
TEST=functional/apptest.py

Review URL: https://chromiumcodereview.appspot.com/10282006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134816 0039d316-1c4b-4281-b951-d872f2087c98

chrome/test/pyautolib/dom_mutation_observer.js

@@ -162,6 +162,7 @@ function(automation_id, observer_id, observer_type, xpath, attribute,
     obs.observe(document,
         { childList: true,
           attributes: true,
+          characterData: true,
           subtree: true});
   }
 
@@ -227,6 +228,7 @@ function(automation_id, observer_id, observer_type, xpath, attribute,
     obs.observe(document,
         { childList: true,
           attributes: true,
+          characterData: true,
           subtree: true});
   }