Remove internal uses of mojo::Array and mojo::WTFArray.

mojo/public/cpp/bindings/tests/wtf_types_unittest.cc

Index: mojo/public/cpp/bindings/tests/wtf_types_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/wtf_types_unittest.cc b/mojo/public/cpp/bindings/tests/wtf_types_unittest.cc
index 03644726665073499a2c9fe5aed43e4ca286c28b..8d9709c6c1c70c51ac2225e7627e8ad21cb73639 100644
--- a/mojo/public/cpp/bindings/tests/wtf_types_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/wtf_types_unittest.cc
@@ -184,7 +184,7 @@ TEST_F(WTFTypesTest, Serialization_PublicAPI) {
 
   blink::TestWTFStructPtr cloned_input = input.Clone();
 
-  WTFArray<uint8_t> data = blink::TestWTFStruct::Serialize(&input);
+  auto data = blink::TestWTFStruct::Serialize(&input);
 
   blink::TestWTFStructPtr output;
   ASSERT_TRUE(blink::TestWTFStruct::Deserialize(std::move(data), &output));