Change cc::ElementId to be a uint64_t

third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializerTest.cpp

Index: third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializerTest.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializerTest.cpp b/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializerTest.cpp
index 87424b9fa663e84a3afc4ed310de8a977b7418ae..3d4eea2827565c6206174b81a9ea80c1f27abd5f 100644
--- a/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializerTest.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializerTest.cpp
@@ -524,7 +524,7 @@ TEST(V8ScriptValueSerializerTest, TransferOffscreenCanvas) {
   OffscreenCanvas* new_canvas =
       V8OffscreenCanvas::toImpl(result.As<v8::Object>());
   EXPECT_EQ(IntSize(10, 7), new_canvas->Size());
-  EXPECT_EQ(519, new_canvas->PlaceholderCanvasId());
+  EXPECT_EQ(519u, new_canvas->PlaceholderCanvasId());
   EXPECT_TRUE(canvas->IsNeutered());
   EXPECT_FALSE(new_canvas->IsNeutered());
 }