Add ExecuteJavaScriptForTest and make all tests use it

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 030108250500b97a7a5f9918aae1a77049b7eb9a..2a69301d51d11fb5c96a3077961b419aea1c061b 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -139,6 +139,10 @@ class CONTENT_EXPORT RenderFrameHostImpl
   void ExecuteJavaScript(const base::string16& javascript) override;
   void ExecuteJavaScript(const base::string16& javascript,
                          const JavaScriptResultCallback& callback) override;
+  void ExecuteJavaScriptForTests(const base::string16& javascript) override;
+  void ExecuteJavaScriptForTests(
+      const base::string16& javascript,
+      const JavaScriptResultCallback& callback) override;
   void ExecuteJavaScriptWithUserGestureForTests(
       const base::string16& javascript) override;
   void ExecuteJavaScriptInIsolatedWorld(
@@ -581,6 +585,9 @@ class CONTENT_EXPORT RenderFrameHostImpl
       const CommonNavigationParams& common_params,
       const RequestNavigationParams& request_params);
 
+  // Returns true if the ExecuteJavaScript() API can be used on this host.
+  bool CanExecuteJavaScript();
+
   // For now, RenderFrameHosts indirectly keep RenderViewHosts alive via a
   // refcount that calls Shutdown when it reaches zero.  This allows each
   // RenderFrameHostManager to just care about RenderFrameHosts, while ensuring