Change all system clock types to int64_t in bitrate_controller.

They are both compared to int64_t types inside the class, and is being called
with int64_t types. Could possibly cause bugs.

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/33529004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7832 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/bitrate_controller/include/bitrate_controller.h b/webrtc/modules/bitrate_controller/include/bitrate_controller.h
index 46d7830..8a558f5 100644
--- a/webrtc/modules/bitrate_controller/include/bitrate_controller.h
+++ b/webrtc/modules/bitrate_controller/include/bitrate_controller.h
@@ -29,9 +29,9 @@
   * per second.
   */
  public:
-  virtual void OnNetworkChanged(const uint32_t target_bitrate,
-                                const uint8_t fraction_loss,  // 0 - 255.
-                                const uint32_t rtt) = 0;
+  virtual void OnNetworkChanged(uint32_t target_bitrate,
+                                uint8_t fraction_loss,  // 0 - 255.
+                                uint32_t rtt) = 0;
 
   virtual ~BitrateObserver() {}
 };
@@ -67,9 +67,9 @@
   *  max_bitrate_kit = 0 equals no max bitrate.
   */
   virtual void SetBitrateObserver(BitrateObserver* observer,
-                                  const uint32_t start_bitrate,
-                                  const uint32_t min_bitrate,
-                                  const uint32_t max_bitrate) = 0;
+                                  uint32_t start_bitrate,
+                                  uint32_t min_bitrate,
+                                  uint32_t max_bitrate) = 0;
 
   virtual void RemoveBitrateObserver(BitrateObserver* observer) = 0;