Remove unused VideoFrameCapturer::size_most_recent() method.

remoting/host/desktop_session_agent.h

Index: remoting/host/desktop_session_agent.h
diff --git a/remoting/host/desktop_session_agent.h b/remoting/host/desktop_session_agent.h
index fbb23c91d1a395592631d38ee8edddf3b042f7f3..b5e6556cc09bcc85c529352bf17ce3b0c49d0475 100644
--- a/remoting/host/desktop_session_agent.h
+++ b/remoting/host/desktop_session_agent.h
@@ -22,6 +22,7 @@
 #include "remoting/host/ui_strings.h"
 #include "remoting/protocol/clipboard_stub.h"
 #include "third_party/skia/include/core/SkRect.h"
+#include "third_party/skia/include/core/SkSize.h"
 
 namespace IPC {
 class ChannelProxy;
@@ -225,6 +226,9 @@ class DesktopSessionAgent
   // IPC channel connecting the desktop process with the network process.
   scoped_ptr<IPC::ChannelProxy> network_channel_;
 
+  // Size of the most recent captured video frame.
+  SkISize current_size_;
+
   // Next shared buffer ID to be used.
   int next_shared_buffer_id_;