Remove unused foreground member variable from SB Protocol Manager.

chrome/browser/safe_browsing/protocol_manager.h

Index: chrome/browser/safe_browsing/protocol_manager.h
diff --git a/chrome/browser/safe_browsing/protocol_manager.h b/chrome/browser/safe_browsing/protocol_manager.h
index 965e502e4b08f31a6e119062323c2ece2eef66c0..275447606dbb93a97f116313532892e6b3d6f3e0 100644
--- a/chrome/browser/safe_browsing/protocol_manager.h
+++ b/chrome/browser/safe_browsing/protocol_manager.h
@@ -191,11 +191,6 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   // Returns whether another update is currently scheduled.
   bool IsUpdateScheduled() const;
 
-  // Called when app changes status of foreground or background.
-  void SetAppInForeground(bool foreground) {
-    app_in_foreground_ = foreground;
-  }
-
  protected:
   // Constructs a SafeBrowsingProtocolManager for |delegate| that issues
   // network requests using |request_context_getter|.
@@ -469,9 +464,6 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   // ID for URLFetchers for testing.
   int url_fetcher_id_;
 
-  // Whether the app is in foreground or background.
-  bool app_in_foreground_;
-
   DISALLOW_COPY_AND_ASSIGN(SafeBrowsingProtocolManager);
 };