WebCrypto: Test error delivery during process().

Tools/DumpRenderTree/chromium/TestRunner/src/MockWebCrypto.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 30 matching lines @@
 
 namespace {
 
 class MockCryptoOperation : public WebKit::WebCryptoOperation {
 public:
     MockCryptoOperation(const WebKit::WebCryptoAlgorithm& algorithm, const WebKit::WebCryptoOperationResult& result) : m_algorithm(algorithm), m_result(result) { }
 
     virtual void process(const unsigned char* bytes, size_t size) OVERRIDE
     {
         // Don't buffer too much data.
-        if (m_data.size() + size > 6)
+        if (m_data.size() + size > 6) {
             m_result.completeWithError();
+            delete this;
+            return;
+        }
 
         if (size)
             m_data.append(reinterpret_cast<const char*>(bytes), size);
     }
 
     virtual void abort() OVERRIDE
     {
         delete this;
     }
 
@@ skipping 60 matching lines @@
         if (keyDataString == "public") {
             type = WebKit::WebCryptoKeyTypePublic;
         } else if (keyDataString == "private") {
             type = WebKit::WebCryptoKeyTypePrivate;
         }
         result.completeWithKey(WebKit::WebCryptoKey::create(0, type, extractable, algorithm, usages));
     }
 }
 
 } // namespace WebTestRunner