Fix web_accesible_resources enforcement for Site Isolation.

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 240eba7416107135f096249c2f9b94954e080c84..7fb0e77d8a2913be65c93a03f4964e5a676d262b 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -416,6 +416,7 @@ NavigationHandleImpl::CheckWillStartRequest() {
 
       case NavigationThrottle::CANCEL:
       case NavigationThrottle::CANCEL_AND_IGNORE:
+      case NavigationThrottle::BLOCK_REQUEST:
         state_ = CANCELING;
         return result;
 
@@ -423,9 +424,6 @@ NavigationHandleImpl::CheckWillStartRequest() {
         state_ = DEFERRING_START;
         next_index_ = i + 1;
         return result;
-
-      default:
-        NOTREACHED();
     }
   }
   next_index_ = 0;
@@ -455,7 +453,7 @@ NavigationHandleImpl::CheckWillRedirectRequest() {
         next_index_ = i + 1;
         return result;
 
-      default:
+      case NavigationThrottle::BLOCK_REQUEST:
         NOTREACHED();
     }
   }
@@ -490,6 +488,9 @@ NavigationHandleImpl::CheckWillProcessResponse() {
         state_ = DEFERRING_RESPONSE;
         next_index_ = i + 1;
         return result;
+
+      case NavigationThrottle::BLOCK_REQUEST:
+        NOTREACHED();
     }
   }
   next_index_ = 0;