Move BrowserMessageFilter to public, and into content namespace.

chrome/browser/spellchecker/spellcheck_message_filter.h

Index: chrome/browser/spellchecker/spellcheck_message_filter.h
diff --git a/chrome/browser/spellchecker/spellcheck_message_filter.h b/chrome/browser/spellchecker/spellcheck_message_filter.h
index 2c0f2ae96e5fc0888e37a3c9643d65bd8895e06f..5d3529ecc4cc061cbc13331792ad1ab7ddeb24e6 100644
--- a/chrome/browser/spellchecker/spellcheck_message_filter.h
+++ b/chrome/browser/spellchecker/spellcheck_message_filter.h
@@ -5,16 +5,16 @@
 #ifndef CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_MESSAGE_FILTER_H_
 
-#include "content/browser/browser_message_filter.h"
+#include "content/public/browser/browser_message_filter.h"
 
 // A message filter implementation that receives
 // the platform spell checker requests from SpellCheckProvider.
-class SpellCheckMessageFilter : public BrowserMessageFilter {
+class SpellCheckMessageFilter : public content::BrowserMessageFilter {
  public:
   explicit SpellCheckMessageFilter(int render_process_id);
   virtual ~SpellCheckMessageFilter();
 
-  // BrowserMessageFilter implementation.
+  // content::BrowserMessageFilter implementation.
   virtual void OverrideThreadForMessage(
       const IPC::Message& message,
       content::BrowserThread::ID* thread) OVERRIDE;