Cleanup usage of history namespace in components/history

components/history/core/browser/top_sites_observer.h

Index: components/history/core/browser/top_sites_observer.h
diff --git a/components/history/core/browser/top_sites_observer.h b/components/history/core/browser/top_sites_observer.h
index 28008de0e152b79ac5b44fc3f227bf9d6c69ef42..443b33f553a1350067b9a263a31bcc5394bc40a6 100644
--- a/components/history/core/browser/top_sites_observer.h
+++ b/components/history/core/browser/top_sites_observer.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 
 namespace history {
+
 class TopSites;
 
 // Interface for observing notifications from TopSites.
@@ -17,11 +18,11 @@ class TopSitesObserver {
   virtual ~TopSitesObserver() {}
 
   // Is called when TopSites finishes loading.
-  virtual void TopSitesLoaded(history::TopSites* top_sites) = 0;
+  virtual void TopSitesLoaded(TopSites* top_sites) = 0;
 
   // Is called when either one of the most visited urls
   // changed, or one of the images changes.
-  virtual void TopSitesChanged(history::TopSites* top_sites) = 0;
+  virtual void TopSitesChanged(TopSites* top_sites) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TopSitesObserver);