Fix errors caused by unsafe conversions to/from size_t

third_party/WebKit/Source/core/fetch/MemoryCacheTest.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 32 matching lines @@
 
 class MemoryCacheTest : public ::testing::Test {
 public:
     class FakeDecodedResource : public Resource {
     public:
         FakeDecodedResource(const ResourceRequest& request, Type type)
             : Resource(request, type)
         {
         }
 
-        virtual void appendData(const char* data, unsigned len)
+        virtual void appendData(const char* data, size_t len)
         {
             Resource::appendData(data, len);
             setDecodedSize(this->size());
         }
 
     protected:
         void destroyDecodedDataIfPossible() override
         {
             setDecodedSize(0);
         }
@@ skipping 467 matching lines @@
 
     WillBeHeapVector<RawPtrWillBeMember<Resource>> resources = memoryCache()->resourcesForURL(url);
     EXPECT_EQ(2u, resources.size());
 
     memoryCache()->evictResources();
     EXPECT_FALSE(memoryCache()->contains(resource1.get()));
     EXPECT_FALSE(memoryCache()->contains(resource3.get()));
 }
 
 } // namespace