Convert RapporRecorder to use mojo.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 840a53be5658f13a052b4621ed58ce7776f20bdb..af6176b21fb9d848b8ef2fc8f4055ff2c4e68739 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -1327,12 +1327,18 @@ ChromeContentRendererClient::CreateBrowserPluginDelegate(
 
 void ChromeContentRendererClient::RecordRappor(const std::string& metric,
                                                const std::string& sample) {
-  RenderThread::Get()->Send(new ChromeViewHostMsg_RecordRappor(metric, sample));
+  if (!rappor_recorder_) {
+    RenderThread::Get()->GetRemoteInterfaces()->GetInterface(&rappor_recorder_);
+  }
+  rappor_recorder_->RecordRappor(metric, sample);
 }
 
 void ChromeContentRendererClient::RecordRapporURL(const std::string& metric,
                                                   const GURL& url) {
-  RenderThread::Get()->Send(new ChromeViewHostMsg_RecordRapporURL(metric, url));
+  if (!rappor_recorder_) {
+    RenderThread::Get()->GetRemoteInterfaces()->GetInterface(&rappor_recorder_);
+  }
+  rappor_recorder_->RecordRapporURL(metric, url);
 }
 
 std::unique_ptr<blink::WebAppBannerClient>