Rename sequence_number to timestamp.

remoting/protocol/host_event_dispatcher.h

Index: remoting/protocol/host_event_dispatcher.h
diff --git a/remoting/protocol/host_event_dispatcher.h b/remoting/protocol/host_event_dispatcher.h
index 968db88081e3a4f6249361a4be60970c2575fa5b..aaa5fe9da055253b04aee2ad9081eb11c5aabfcb 100644
--- a/remoting/protocol/host_event_dispatcher.h
+++ b/remoting/protocol/host_event_dispatcher.h
@@ -18,7 +18,7 @@ class InputStub;
 // channel to InputStub.
 class HostEventDispatcher : public ChannelDispatcherBase {
  public:
-  typedef base::Callback<void(int64)> SequenceNumberCallback;
+  typedef base::Callback<void(int64)> EventTimestampCallback;
 
   HostEventDispatcher();
   ~HostEventDispatcher() override;
@@ -30,8 +30,8 @@ class HostEventDispatcher : public ChannelDispatcherBase {
 
   // Set callback to notify of each message's sequence number. The
   // callback cannot tear down this object.
-  void set_sequence_number_callback(const SequenceNumberCallback& value) {
-    sequence_number_callback_ = value;
+  void set_event_timestamp_callback(const EventTimestampCallback& value) {
+    event_timestamp_callback_ = value;
   }
 
  protected:
@@ -43,7 +43,7 @@ class HostEventDispatcher : public ChannelDispatcherBase {
                          const base::Closure& done_task);
 
   InputStub* input_stub_;
-  SequenceNumberCallback sequence_number_callback_;
+  EventTimestampCallback event_timestamp_callback_;
 
   ProtobufMessageReader<EventMessage> reader_;