content/browser: Move more files into the content namespace.

content/browser/mime_registry_message_filter.h

Index: content/browser/mime_registry_message_filter.h
diff --git a/content/browser/mime_registry_message_filter.h b/content/browser/mime_registry_message_filter.h
index 3b27d6b6ffd6be9fc87e7b5631480b8546515334..dffdb2c3766d458451005fc26c6ecae06fbe9ee5 100644
--- a/content/browser/mime_registry_message_filter.h
+++ b/content/browser/mime_registry_message_filter.h
@@ -8,13 +8,14 @@
 #include "base/file_path.h"
 #include "content/public/browser/browser_message_filter.h"
 
-class MimeRegistryMessageFilter : public content::BrowserMessageFilter {
+namespace content {
+
+class MimeRegistryMessageFilter : public BrowserMessageFilter {
  public:
   MimeRegistryMessageFilter();
 
-  virtual void OverrideThreadForMessage(
-      const IPC::Message& message,
-      content::BrowserThread::ID* thread) OVERRIDE;
+  virtual void OverrideThreadForMessage(const IPC::Message& message,
+                                        BrowserThread::ID* thread) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
@@ -29,4 +30,6 @@ class MimeRegistryMessageFilter : public content::BrowserMessageFilter {
                                           FilePath::StringType* extension);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_BROWSER_MIME_REGISTRY_MESSAGE_FILTER_H_