Move Extension into extensions namespace

chrome/browser/extensions/extension_info_map.h

Index: chrome/browser/extensions/extension_info_map.h
diff --git a/chrome/browser/extensions/extension_info_map.h b/chrome/browser/extensions/extension_info_map.h
index df8a6c5fe2e474184677b42d2013636afae4841b..8a64d55fdfba63f4bb56b6bcf66e03c163d55a33 100644
--- a/chrome/browser/extensions/extension_info_map.h
+++ b/chrome/browser/extensions/extension_info_map.h
@@ -17,7 +17,9 @@
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_set.h"
 
+namespace extensions {
 class Extension;
+}
 
 // Contains extension data that needs to be accessed on the IO thread. It can
 // be created/destroyed on any thread, but all other methods must be called on
@@ -34,7 +36,7 @@ class ExtensionInfoMap : public base::RefCountedThreadSafe<ExtensionInfoMap> {
   const extensions::ProcessMap& process_map() const;
 
   // Callback for when new extensions are loaded.
-  void AddExtension(const Extension* extension,
+  void AddExtension(const extensions::Extension* extension,
                     base::Time install_time,
                     bool incognito_enabled);
 
@@ -51,7 +53,7 @@ class ExtensionInfoMap : public base::RefCountedThreadSafe<ExtensionInfoMap> {
 
   // Returns true if the given extension can see events and data from another
   // sub-profile (incognito to original profile, or vice versa).
-  bool CanCrossIncognito(const Extension* extension);
+  bool CanCrossIncognito(const extensions::Extension* extension);
 
   // Adds an entry to process_map_.
   void RegisterExtensionProcess(const std::string& extension_id,