When long pressing on title bar, do not use WebView in onCreateContextMenu

Fix for http://b/issue?id=2456405

Override TitleBar::createContextMenu to call BrowserActivity's onCreateContextMenu
directly, so that WebView is ignored, and we only get the options for TitleBar.
diff --git a/src/com/android/browser/BrowserActivity.java b/src/com/android/browser/BrowserActivity.java
index 52a3125..fc337f9 100644
--- a/src/com/android/browser/BrowserActivity.java
+++ b/src/com/android/browser/BrowserActivity.java
@@ -1693,6 +1693,9 @@
     @Override
     public void onCreateContextMenu(ContextMenu menu, View v,
             ContextMenuInfo menuInfo) {
+        if (v instanceof TitleBar) {
+            return;
+        }
         WebView webview = (WebView) v;
         WebView.HitTestResult result = webview.getHitTestResult();
         if (result == null) {