Tighten up compile warnings based to match other chromium sub-projects....

remoting/client/plugin/chromoting_plugin.cc

 // Copyright (c) 2010 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/client/plugin/chromoting_plugin.h"
 
 #include "remoting/client/plugin/client.h"
 
 namespace remoting {
 
@@ skipping 53 matching lines @@
 
   client_->set_window();
 
   draw();
 
   return NPERR_NO_ERROR;
 }
 
 int16 ChromotingPlugin::HandleEvent(void* event) {
   NPPepperEvent* npevent = static_cast<NPPepperEvent*>(event);
-  char ch;
 
   switch (npevent->type) {
     case NPEventType_MouseDown:
       // Fall through
     case NPEventType_MouseUp:
       // Fall through
     case NPEventType_MouseMove:
       // Fall through
     case NPEventType_MouseEnter:
       // Fall through
@@ skipping 20 matching lines @@
 
 NPError ChromotingPlugin::GetValue(NPPVariable variable, void* value) {
   return NPERR_NO_ERROR;
 }
 
 NPError ChromotingPlugin::SetValue(NPNVariable variable, void* value) {
   return NPERR_NO_ERROR;
 }
 
 }  // namespace remoting