Move BrowserThread to content namespace.

chrome/browser/safe_browsing/malware_details_history.h

Index: chrome/browser/safe_browsing/malware_details_history.h
diff --git a/chrome/browser/safe_browsing/malware_details_history.h b/chrome/browser/safe_browsing/malware_details_history.h
index b0eafb7dbc1946aa45fc5cbb219e585d14e94c23..f2776c6be7839cbd087738fda1b2a4675e4bb6a3 100644
--- a/chrome/browser/safe_browsing/malware_details_history.h
+++ b/chrome/browser/safe_browsing/malware_details_history.h
@@ -28,8 +28,9 @@ typedef std::vector<GURL> RedirectChain;
 }
 
 class MalwareDetailsRedirectsCollector
-    : public base::RefCountedThreadSafe<MalwareDetailsRedirectsCollector,
-                                        BrowserThread::DeleteOnUIThread>,
+    : public base::RefCountedThreadSafe<
+          MalwareDetailsRedirectsCollector,
+          content::BrowserThread::DeleteOnUIThread>,
       public content::NotificationObserver {
 
  public:
@@ -49,7 +50,8 @@ class MalwareDetailsRedirectsCollector
   const std::vector<safe_browsing::RedirectChain>& GetCollectedUrls() const;
 
  private:
-  friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
+  friend struct content::BrowserThread::DeleteOnThread<
+      content::BrowserThread::UI>;
   friend class DeleteTask<MalwareDetailsRedirectsCollector>;
 
   Profile* profile_;