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

content/renderer/render_process_impl.cc

Index: content/renderer/render_process_impl.cc
===================================================================
--- content/renderer/render_process_impl.cc	(revision 163290)
+++ content/renderer/render_process_impl.cc	(working copy)
@@ -34,6 +34,8 @@
 #include "base/mac/mac_util.h"
 #endif
 
+namespace content {
+
 RenderProcessImpl::RenderProcessImpl()
     : ALLOW_THIS_IN_INITIALIZER_LIST(shared_mem_cache_cleaner_(
           FROM_HERE, base::TimeDelta::FromSeconds(5),
@@ -246,3 +248,5 @@
     }
   }
 }
+
+}  // namespace content