Make DOMArrayBuffer()::byteLength() return unsigned int to match the type of its backing data.

R=yukishiino@chromium.org
TBR=haraken@chromium.org
TESTS=build on Linux
BUG=

Review URL: https://codereview.chromium.org/717873005

git-svn-id: svn://svn.chromium.org/blink/trunk@185188 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/dom/DOMArrayBuffer.h

@@ -38,7 +38,7 @@ public:
 
     const void* data() const { return buffer()->data(); }
     void* data() { return buffer()->data(); }
-    unsigned long byteLength() const { return buffer()->byteLength(); }
+    unsigned byteLength() const { return buffer()->byteLength(); }
     PassRefPtr<DOMArrayBuffer> slice(int begin, int end) const
     {
         return create(buffer()->slice(begin, end));