Fix errors caused by unsafe conversions to/from size_t

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

Index: third_party/WebKit/Source/core/fetch/MemoryCacheTest.cpp
diff --git a/third_party/WebKit/Source/core/fetch/MemoryCacheTest.cpp b/third_party/WebKit/Source/core/fetch/MemoryCacheTest.cpp
index 2feb55003c6f0941a543d40b746772358603a758..c0fe0b05116d38812501ab8950a87dd88845fb6e 100644
--- a/third_party/WebKit/Source/core/fetch/MemoryCacheTest.cpp
+++ b/third_party/WebKit/Source/core/fetch/MemoryCacheTest.cpp
@@ -50,7 +50,7 @@ public:
         {
         }
 
-        virtual void appendData(const char* data, unsigned len)
+        virtual void appendData(const char* data, size_t len)
         {
             Resource::appendData(data, len);
             setDecodedSize(this->size());