PlzNavigate: Invoke didFailProvisionalLoad() in the renderer when a navigation request is cancelled…

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index be2a44ff74a1682d1ed5ac2304f6b3f4119199c8..26bd2f95c92e404ed37be2e1c80177c58efb2a69 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -1239,6 +1239,11 @@ void FrameLoader::stopAllLoaders() {
 
   m_inStopAllLoaders = true;
 
+  if (m_isNavigationHandledByClient) {
+    client()->dispatchDidFailProvisionalLoad(
+        ResourceError::cancelledError(String()), StandardCommit);
+  }
+
   m_isNavigationHandledByClient = false;
 
   for (Frame* child = m_frame->tree().firstChild(); child;