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/bitrate_controller_unittest.cc b/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc
index 040cfec..6344ee8 100644
--- a/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc
+++ b/webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc
@@ -43,9 +43,9 @@
         last_rtt_(0) {
   }
 
-  virtual void OnNetworkChanged(const uint32_t bitrate,
-                                const uint8_t fraction_loss,
-                                const uint32_t rtt) {
+  virtual void OnNetworkChanged(uint32_t bitrate,
+                                uint8_t fraction_loss,
+                                uint32_t rtt) {
     last_bitrate_ = bitrate;
     last_fraction_loss_ = fraction_loss;
     last_rtt_ = rtt;