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 bb040a6bc891bc48cb7f605a17f59329d76a3a31..90090df45ea65bab63e4a714cfee6df122c6ef2b 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -6,7 +6,6 @@
 
 #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"
 
@@ -224,11 +223,6 @@ BrowserPluginDelegate* ContentRendererClient::CreateBrowserPluginDelegate(
   return nullptr;
 }
 
-std::unique_ptr<blink::WebAppBannerClient>
-ContentRendererClient::CreateAppBannerClient(RenderFrame* render_frame) {
-  return nullptr;
-}
-
 bool ContentRendererClient::ShouldEnforceWebRTCRoutingPreferences() {
   return true;
 }