Make clicks on <a> request a navigation

sky/viewer/document_view.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/viewer/document_view.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 169 matching lines @@
   if (frame != web_view_->mainFrame())
     return;
   script_runner_.reset(new ScriptRunner(frame, context));
 
   v8::Isolate* isolate = context->GetIsolate();
   gin::Handle<Internals> internals = Internals::Create(isolate, this);
   context->Global()->Set(gin::StringToV8(isolate, "internals"),
                          gin::ConvertToV8(isolate, internals));
 }
 
-blink::ServiceProvider* DocumentView::services() {
-  return this;
+blink::ServiceProvider& DocumentView::services() {
+  return *this;
 }
 
 mojo::NavigatorHost* DocumentView::NavigatorHost() {
   return navigator_host_.get();
 }
 
 void DocumentView::OnViewBoundsChanged(mojo::View* view,
                                        const mojo::Rect& old_bounds,
                                        const mojo::Rect& new_bounds) {
   DCHECK_EQ(view, root_);
   gfx::Size size = new_bounds.To<gfx::Rect>().size();
   web_view_->resize(size);
   web_layer_tree_view_impl_->setViewportSize(size);
 }
 
 void DocumentView::OnViewDestroyed(mojo::View* view) {
   DCHECK_EQ(view, root_);
   delete this;
 }
 
 void DocumentView::OnViewInputEvent(
     mojo::View* view, const mojo::EventPtr& event) {
   scoped_ptr<blink::WebInputEvent> web_event =
       event.To<scoped_ptr<blink::WebInputEvent> >();
   if (web_event)
     web_view_->handleInputEvent(*web_event);
 }
 
 }  // namespace sky