Tidy up ChromotingInstance members a little.

remoting/protocol/mouse_input_filter.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/protocol/mouse_input_filter.h"
 
 #include "remoting/proto/event.pb.h"
 
 namespace remoting {
 namespace protocol {
 
+MouseInputFilter::MouseInputFilter() {
+}
+
 MouseInputFilter::MouseInputFilter(InputStub* input_stub)
     : InputFilter(input_stub) {
   input_max_.setEmpty();
   output_max_.setEmpty();
 }
 
 MouseInputFilter::~MouseInputFilter() {
 }
 
 void MouseInputFilter::InjectMouseEvent(const MouseEvent& event) {
@@ skipping 22 matching lines @@
 void MouseInputFilter::set_input_size(const SkISize& size) {
   input_max_ = SkISize::Make(size.width() - 1, size.height() - 1);
 }
 
 void MouseInputFilter::set_output_size(const SkISize& size) {
   output_max_ = SkISize::Make(size.width() - 1, size.height() - 1);
 }
 
 }  // namespace protocol
 }  // namespace remoting