Revert of PlzNavigate: send SourceLocation when mixed content is found

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 c3c3fa73f859706e237d986e0e520be77c31fb6b..41bedf9300dac15f59c3448b550f5600123f9236 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -370,11 +370,6 @@
     return should_check_main_world_csp_;
   }
 
-  const SourceLocation& source_location() const { return source_location_; }
-  void set_source_location(const SourceLocation& source_location) {
-    source_location_ = source_location;
-  }
-
  private:
   friend class NavigationHandleImplTest;
 
@@ -551,11 +546,6 @@
   // Whether or not the navigation results from the submission of a form.
   bool is_form_submission_;
 
-  // PlzNavigate
-  // Information about the JavaScript that started the navigation. For
-  // navigations initiated by Javascript.
-  SourceLocation source_location_;
-
   base::WeakPtrFactory<NavigationHandleImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationHandleImpl);