Unselect text before rotating

When rotating, we receive events from the renderer in an unexpected
order (we get a SelectionBoundsChanged call with points in the new
window position before the CompositorFrameMessage and so we misinterpret
the SelectionBoundsChanged).

For now, we should simply unselect the text before rotating.

BUG=174665


Review URL: https://chromiumcodereview.appspot.com/12221150

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182074 0039d316-1c4b-4281-b951-d872f2087c98

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

@@ -1300,6 +1300,12 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
         }
 
         if (mNeedUpdateOrientationChanged) {
+            // TODO(cjhopman): Once selection bounds are received from the renderer as absolute
+            // positions, we will no longer need to unselect before rotation (though we may decide
+            // it is the correct behavior).
+            // http://crbug.com/174665
+            mImeAdapter.unselect();
+
             sendOrientationChangeEvent();
             mNeedUpdateOrientationChanged = false;
         }