Move a bunch of code in content\common (as well as a few left in renderer) to the content namespace.

content/renderer/plugin_channel_host.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 "content/renderer/plugin_channel_host.h"
 
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "content/common/child_process.h"
 #include "content/common/npobject_base.h"
 #include "content/common/plugin_messages.h"
 
 #if defined(OS_POSIX)
 #include "ipc/ipc_channel_posix.h"
 #endif
 
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
 
+namespace content {
+
 // TODO(shess): Debugging for http://crbug.com/97285
 //
 // The hypothesis at #55 requires that RemoveRoute() be called between
 // sending ViewHostMsg_OpenChannelToPlugin to the browser, and calling
 // GetPluginChannelHost() on the result.  This code detects that case
 // and stores the backtrace of the RemoveRoute() in a breakpad key.
 // The specific RemoveRoute() is not tracked (there could be multiple,
 // and which is the one can't be known until the open completes), but
 // the backtrace from any such nested call should be sufficient to
 // drive a repro.
@@ skipping 190 matching lines @@
 
   NPChannelBase::OnChannelError();
 
   for (ProxyMap::iterator iter = proxies_.begin();
        iter != proxies_.end(); iter++) {
     iter->second->OnChannelError();
   }
 
   proxies_.clear();
 }
+
+}  // namespace content