Componentize OriginsSeenService & provide iOS factory.

chrome/browser/tab_contents/navigation_metrics_recorder.cc

Index: chrome/browser/tab_contents/navigation_metrics_recorder.cc
diff --git a/chrome/browser/tab_contents/navigation_metrics_recorder.cc b/chrome/browser/tab_contents/navigation_metrics_recorder.cc
index f5078585f7233a141a98cbc612e76b17bc65c4f5..4f7174297dc20595f509d943317f089d276a934d 100644
--- a/chrome/browser/tab_contents/navigation_metrics_recorder.cc
+++ b/chrome/browser/tab_contents/navigation_metrics_recorder.cc
@@ -7,9 +7,9 @@
 #include "base/metrics/histogram_macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/tab_contents/origins_seen_service.h"
 #include "chrome/browser/tab_contents/origins_seen_service_factory.h"
 #include "components/navigation_metrics/navigation_metrics.h"
+#include "components/navigation_metrics/origins_seen_service.h"
 #include "components/rappor/rappor_utils.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
@@ -42,7 +42,7 @@ void NavigationMetricsRecorder::DidNavigateMainFrame(
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   content::BrowserContext* context = web_contents()->GetBrowserContext();
-  OriginsSeenService* service =
+  navigation_metrics::OriginsSeenService* service =
       OriginsSeenServiceFactory::GetForBrowserContext(context);
   const url::Origin origin(details.entry->GetVirtualURL());
   bool have_already_seen_origin = service->Insert(origin);