[Blimp] Refactor Blimp test engine with embedded test server and URL rewriting

blimp/engine/app/blimp_content_main_delegate.h

Index: blimp/engine/app/blimp_content_main_delegate.h
diff --git a/blimp/engine/app/blimp_content_main_delegate.h b/blimp/engine/app/blimp_content_main_delegate.h
index 3de47c085a5e4c1cffd57abb2d24d4c910052934..55c52ba777836f3344d3fce4af38e03f08a39c96 100644
--- a/blimp/engine/app/blimp_content_main_delegate.h
+++ b/blimp/engine/app/blimp_content_main_delegate.h
@@ -30,6 +30,9 @@ class BlimpContentMainDelegate : public content::ContentMainDelegate {
   content::ContentBrowserClient* CreateContentBrowserClient() override;
   content::ContentRendererClient* CreateContentRendererClient() override;
 
+  void SetContentBrowserClientForTesting(
+      std::unique_ptr<BlimpContentBrowserClient> browser_client_ptr);
+
  private:
   void InitializeResourceBundle();
 
@@ -37,7 +40,7 @@ class BlimpContentMainDelegate : public content::ContentMainDelegate {
   std::unique_ptr<BlimpContentRendererClient> renderer_client_;
   BlimpContentClient content_client_;
 
-  DISALLOW_COPY_AND_ASSIGN(BlimpContentMainDelegate);
+  // DISALLOW_COPY_AND_ASSIGN(BlimpContentMainDelegate);
 };
 
 }  // namespace engine