Convert app banners to use Mojo.

content/public/renderer/content_renderer_client.cc

Index: content/public/renderer/content_renderer_client.cc
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
index 2a70221a30953a1a4d118671bdb3e67a4696f72e..82daaaa06038b8e1a2ccf3e2317a51c127f8ae08 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -7,7 +7,6 @@
 #include "cc/blimp/remote_compositor_bridge.h"
 #include "content/public/renderer/media_stream_renderer_factory.h"
 #include "media/base/renderer_factory.h"
-#include "third_party/WebKit/public/platform/modules/app_banner/WebAppBannerClient.h"
 #include "ui/gfx/icc_profile.h"
 #include "url/gurl.h"
 
@@ -232,11 +231,6 @@ BrowserPluginDelegate* ContentRendererClient::CreateBrowserPluginDelegate(
   return nullptr;
 }
 
-std::unique_ptr<blink::WebAppBannerClient>
-ContentRendererClient::CreateAppBannerClient(RenderFrame* render_frame) {
-  return nullptr;
-}
-
 bool ContentRendererClient::ShouldEnforceWebRTCRoutingPreferences() {
   return true;
 }