Move constants used by history component to history namespace

chrome/browser/history/top_sites_impl.cc

Index: chrome/browser/history/top_sites_impl.cc
diff --git a/chrome/browser/history/top_sites_impl.cc b/chrome/browser/history/top_sites_impl.cc
index ba422eeef1502295ed52669de5e4224b25502e9a..854c18f72b2c6e2a271bb98aacc0e5a8c9ee5f3c 100644
--- a/chrome/browser/history/top_sites_impl.cc
+++ b/chrome/browser/history/top_sites_impl.cc
@@ -151,7 +151,7 @@ bool TopSitesImpl::SetPageThumbnail(const GURL& url,
     }
   }
 
-  if (!HistoryService::CanAddURL(url))
+  if (!CanAddURL(url))
     return false;  // It's not a real webpage.
 
   scoped_refptr<base::RefCountedBytes> thumbnail_data;
@@ -190,7 +190,7 @@ bool TopSitesImpl::SetPageThumbnailToJPEGBytes(
     }
   }
 
-  if (!HistoryService::CanAddURL(url))
+  if (!CanAddURL(url))
     return false;  // It's not a real webpage.
 
   if (add_temp_thumbnail) {
@@ -777,7 +777,7 @@ void TopSitesImpl::Observe(int type,
       if (!load_details)
         return;
       const GURL& url = load_details->entry->GetURL();
-      if (!cache_->IsKnownURL(url) && HistoryService::CanAddURL(url)) {
+      if (!cache_->IsKnownURL(url) && CanAddURL(url)) {
         // To avoid slamming history we throttle requests when the url updates.
         // To do otherwise negatively impacts perf tests.
         RestartQueryForTopSitesTimer(GetUpdateDelay());