Revert of Fix content verifier problem with content scripts

extensions/browser/content_verifier.h

Index: extensions/browser/content_verifier.h
diff --git a/extensions/browser/content_verifier.h b/extensions/browser/content_verifier.h
index 8d6f47b5c64b6c635f647911edbbdd1f63c1cce7..47f67c1411be6c1770eac92098a63b417af67dda 100644
--- a/extensions/browser/content_verifier.h
+++ b/extensions/browser/content_verifier.h
@@ -37,13 +37,6 @@
 class ContentVerifier : public base::RefCountedThreadSafe<ContentVerifier>,
                         public ExtensionRegistryObserver {
  public:
-  class TestObserver {
-   public:
-    virtual void OnFetchComplete(const std::string& extension_id,
-                                 bool success) = 0;
-  };
-  static void SetObserverForTests(TestObserver* observer);
-
   // Takes ownership of |delegate|.
   ContentVerifier(content::BrowserContext* context,
                   ContentVerifierDelegate* delegate);