Remove unneeded extension_messages_browsertest.cc + cleanup.

chrome/renderer/extensions/extension_dispatcher.h

Index: chrome/renderer/extensions/extension_dispatcher.h
diff --git a/chrome/renderer/extensions/extension_dispatcher.h b/chrome/renderer/extensions/extension_dispatcher.h
index 0b0eb2530bb64342809e50d43eb0ddfbbdb860d0..4e8736645313c3fb4a162bde205b3b267ac6aad9 100644
--- a/chrome/renderer/extensions/extension_dispatcher.h
+++ b/chrome/renderer/extensions/extension_dispatcher.h
@@ -89,9 +89,6 @@ class ExtensionDispatcher : public content::RenderProcessObserver {
                                 v8::Handle<v8::Context> context,
                                 int world_id);
 
-  void SetTestExtensionId(const std::string& extension_id);
-  bool IsTestExtensionId(const std::string& id);
-
   // TODO(mpcomplete): remove. http://crbug.com/100411
   bool IsAdblockWithWebRequestInstalled() const {
     return webrequest_adblock_;
@@ -222,8 +219,6 @@ class ExtensionDispatcher : public content::RenderProcessObserver {
   // True once WebKit has been initialized (and it is therefore safe to poke).
   bool is_webkit_initialized_;
 
-  std::string test_extension_id_;
-
   // Status of webrequest usage for known extensions.
   // TODO(mpcomplete): remove. http://crbug.com/100411
   bool webrequest_adblock_;