Revert of PlzNavigate: Enforce 'frame-src' CSP on the browser.

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index 819d847e9abfd8fdb2875405a7a87722d0cb5e27..8372a46a37a1bb6eb2a5e1ce7ab6b402887c5fca 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -91,8 +91,7 @@
       bool is_same_page,
       const base::TimeTicks& navigation_start,
       int pending_nav_entry_id,
-      bool started_from_context_menu,
-      CSPDisposition should_check_main_world_csp);
+      bool started_from_context_menu);
   ~NavigationHandleImpl() override;
 
   // Used to track the state the navigation is currently in.
@@ -360,10 +359,6 @@
     base_url_for_data_url_ = url;
   }
 
-  CSPDisposition should_check_main_world_csp() const {
-    return should_check_main_world_csp_;
-  }
-
  private:
   friend class NavigationHandleImplTest;
 
@@ -374,8 +369,7 @@
                        bool is_same_page,
                        const base::TimeTicks& navigation_start,
                        int pending_nav_entry_id,
-                       bool started_from_context_menu,
-                       CSPDisposition should_check_main_world_csp);
+                       bool started_from_context_menu);
 
   NavigationThrottle::ThrottleCheckResult CheckWillStartRequest();
   NavigationThrottle::ThrottleCheckResult CheckWillRedirectRequest();
@@ -531,11 +525,6 @@
   net::HostPortPair socket_address_;
   NavigationType navigation_type_;
 
-  // Whether or not the CSP of the main world should apply. When the navigation
-  // is initiated from a content script in an isolated world, the CSP defined
-  // in the main world should not apply.
-  CSPDisposition should_check_main_world_csp_;
-
   base::WeakPtrFactory<NavigationHandleImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);