Fix "unreachable code" warnings (MSVC warning 4702) in content/.

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 1281 matching lines @@
   // died due to fast shutdown versus another cause.
   fast_shutdown_started_ = true;
 
   ProcessDied(false /* already_dead */);
   return true;
 }
 
 void RenderProcessHostImpl::DumpHandles() {
 #if defined(OS_WIN)
   Send(new ChildProcessMsg_DumpHandles());
-  return;
+#else
+  NOTIMPLEMENTED();
 #endif
-
-  NOTIMPLEMENTED();
 }
 
 // This is a platform specific function for mapping a transport DIB given its id
 TransportDIB* RenderProcessHostImpl::MapTransportDIB(
     TransportDIB::Id dib_id) {
 #if defined(OS_WIN)
   // On Windows we need to duplicate the handle from the remote process
   HANDLE section;
   DuplicateHandle(GetHandle(), dib_id.handle, GetCurrentProcess(), &section,
                   FILE_MAP_READ | FILE_MAP_WRITE,
@@ skipping 857 matching lines @@
         child_process_launcher_->GetHandle();
     base::PlatformFile client_file =
         PlatformFileFromScopedPlatformHandle(channel_pair.PassClientHandle());
     Send(new MojoMsg_ChannelCreated(
              IPC::GetFileHandleForProcess(client_file, process_handle, true)));
   }
 }
 #endif
 
 }  // namespace content