Move the remaning files in content\common to the content namespace.

content/browser/child_process_launcher.h

Index: content/browser/child_process_launcher.h
===================================================================
--- content/browser/child_process_launcher.h	(revision 163632)
+++ content/browser/child_process_launcher.h	(working copy)
@@ -12,6 +12,8 @@
 
 class CommandLine;
 
+namespace content {
+
 // Launches a process asynchronously and notifies the client of the process
 // handle when it's available.  It's used to avoid blocking the calling thread
 // on the OS since often it can take > 100 ms to create the process.
@@ -72,4 +74,6 @@
   DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_