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

content/common/webmessageportchannel_impl.cc

Index: content/common/webmessageportchannel_impl.cc
===================================================================
--- content/common/webmessageportchannel_impl.cc	(revision 163290)
+++ content/common/webmessageportchannel_impl.cc	(working copy)
@@ -16,6 +16,8 @@
 using WebKit::WebMessagePortChannelClient;
 using WebKit::WebString;
 
+namespace content {
+
 WebMessagePortChannelImpl::WebMessagePortChannelImpl()
     : client_(NULL),
       route_id_(MSG_ROUTING_NONE),
@@ -248,3 +250,5 @@
 WebMessagePortChannelImpl::Message::Message() {}
 
 WebMessagePortChannelImpl::Message::~Message() {}
+
+}  // namespace content