Fix CHECK condition in ImageResource

third_party/WebKit/Source/core/fetch/ImageResource.cpp

Index: third_party/WebKit/Source/core/fetch/ImageResource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ImageResource.cpp b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
index f9b25215b01aee542b3ff782b100b12d8887fa10..41e87dfc8bc39fe9d4a6b2f2753c3bad8e7cb31d 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
@@ -218,7 +218,7 @@ void ImageResource::doResetAnimation()
 void ImageResource::allClientsAndObserversRemoved()
 {
     if (m_image) {
-        CHECK(!errorOccurred());
+        CHECK(m_image->isNull() || !errorOccurred());
         // If possible, delay the resetting until back at the event loop.
         // Doing so after a conservative GC prevents resetAnimation() from
         // upsetting ongoing animation updates (crbug.com/613709)