Cancel image loads if decoding failed.

third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp

Index: third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
index b3bd7d93278ee227f858d7c18dbbf28eacff334c..2db06cd59449567bdb89c4940156bea6fadf0768 100644
--- a/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/ImageDecoder.cpp
@@ -80,12 +80,16 @@ inline bool matchesBMPSignature(const char* contents)
     return !memcmp(contents, "BM", 2);
 }
 
-std::unique_ptr<ImageDecoder> ImageDecoder::create(const char* contents, size_t length, AlphaOption alphaOption, GammaAndColorProfileOption colorOptions)
+size_t ImageDecoder::longestSignatureLength()
 {
     const size_t longestSignatureLength = sizeof("RIFF????WEBPVP") - 1;
-    ASSERT(longestSignatureLength == 14);
+    DCHECK_EQ(14u, longestSignatureLength);
+    return 14u;
+}
 
-    if (length < longestSignatureLength)
+std::unique_ptr<ImageDecoder> ImageDecoder::create(const char* contents, size_t length, AlphaOption alphaOption, GammaAndColorProfileOption colorOptions)
+{
+    if (length < longestSignatureLength())
         return nullptr;
 
     size_t maxDecodedBytes = Platform::current() ? Platform::current()->maxDecodedImageBytes() : noDecodedImageByteLimit;