Selection popup is present even after focus is changed.

Existing selection handles should be cleared when
focus is changed from ContentView to URL.The issue
seems happening because the selection is null.So,
I have added the functionality to clear the handles
even if selection is empty.

BUG=397041

Review URL: https://codereview.chromium.org/413143003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285940 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -1691,6 +1691,7 @@ public void onFocusChanged(boolean gainFocus) {
             hideImeIfNeeded();
             cancelRequestToScrollFocusedEditableNodeIntoView();
             hidePastePopup();
+            hideTextHandles();
         }
         if (mNativeContentViewCore != 0) nativeSetFocus(mNativeContentViewCore, gainFocus);
     }