Add a new GetInstance() method for singleton classes under chrome/service and /net.

net/websockets/websocket_throttle.h

Index: net/websockets/websocket_throttle.h
diff --git a/net/websockets/websocket_throttle.h b/net/websockets/websocket_throttle.h
index 0849834befa1dfaca0e43a97338d49d74e7dea47..8eaefb8b4df7971032aed425a5fc81e1e178485e 100644
--- a/net/websockets/websocket_throttle.h
+++ b/net/websockets/websocket_throttle.h
@@ -27,6 +27,9 @@ class WebSocketJob;
 //        for that connection to have failed.
 class WebSocketThrottle {
  public:
+  // Returns the singleton instance.
+  static WebSocketThrottle* GetInstance();
+
   // Puts |job| in |queue_| and queues for the destination addresses
   // of |job|.
   // If other job is using the same destination address, set |job| waiting.