Convert most of extensions and some other random stuff to using the base namespace for Values.

content/browser/devtools/devtools_protocol.h

Index: content/browser/devtools/devtools_protocol.h
diff --git a/content/browser/devtools/devtools_protocol.h b/content/browser/devtools/devtools_protocol.h
index a2ef7db95f2244beec636a7d975b7a703b7dfe75..d3029ae30197d13cc8a0b36770db6fdd0ae16c5b 100644
--- a/content/browser/devtools/devtools_protocol.h
+++ b/content/browser/devtools/devtools_protocol.h
@@ -151,8 +151,8 @@ class DevToolsProtocol {
                                           base::DictionaryValue* params);
 
  private:
-  static DictionaryValue* ParseMessage(const std::string& json,
-                                       std::string* error_response);
+  static base::DictionaryValue* ParseMessage(const std::string& json,
+                                             std::string* error_response);
 
   DevToolsProtocol() {}
   ~DevToolsProtocol() {}