Bug fix: Fix wrong assumption in ImageResource when adding observer

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

Index: third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp b/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
index 09937a62189e22198624953086078889bb59b310..bf0a71e5050c9e66e51f824a7e26c6fc56440c08 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
+++ b/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
@@ -231,6 +231,12 @@ TEST(ImageResourceTest, MultipartImage)
     ASSERT_EQ(client->imageChangedCount(), 0);
     ASSERT_FALSE(client->notifyFinishedCalled());
 
+    // Add a client to check an assertion error doesn't happen
+    // (crbug.com/630983).
+    Persistent<MockImageResourceClient> client2 = new MockImageResourceClient(cachedImage);
+    ASSERT_EQ(client2->imageChangedCount(), 0);
+    ASSERT_FALSE(client2->notifyFinishedCalled());
+
     const char thirdPart[] = "--boundary";
     cachedImage->appendData(thirdPart, strlen(thirdPart));
     ASSERT_TRUE(cachedImage->resourceBuffer());