Adds plumbing to pass WebUI mojo::Handle from browser to renderer

content/renderer/web_ui_mojo.h

Index: content/renderer/web_ui_mojo.h
diff --git a/content/renderer/web_ui_mojo.h b/content/renderer/web_ui_mojo.h
index 5b9e591c2804dd5ba3f1039b408193387ec7b7c3..09f1a8f16774d8c45df6ea7c99e2af95baf0ecd9 100644
--- a/content/renderer/web_ui_mojo.h
+++ b/content/renderer/web_ui_mojo.h
@@ -10,7 +10,7 @@
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "content/public/renderer/render_view_observer_tracker.h"
-#include "mojo/public/system/core.h"
+#include "mojo/public/system/core_cpp.h"
 
 namespace gin {
 class PerContextData;
@@ -30,6 +30,9 @@ class WebUIMojo
  public:
   explicit WebUIMojo(RenderView* render_view);
 
+  // Sets the handle to the current WebUI.
+  void SetBrowserHandle(mojo::ScopedMessagePipeHandle handle);
+
  private:
   class MainFrameObserver : public RenderFrameObserver {
    public:
@@ -48,10 +51,6 @@ class WebUIMojo
 
   virtual ~WebUIMojo();
 
-  // Invoked from ViewMsg_SetBrowserHandle. Passes handle to current
-  // MojoWebUIContextState.
-  void OnSetBrowserHandle(MojoHandle handle);
-
   void CreateContextState();
   void DestroyContextState(v8::Handle<v8::Context> context);