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

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 441 matching lines @@
   input.get_mutable_string_array().assign({ "hello", "world!" });
   input.get_mutable_string_set().insert("hello");
   input.get_mutable_string_set().insert("world!");
   input.get_mutable_struct().value = 42;
   input.get_mutable_struct_array().resize(2);
   input.get_mutable_struct_array()[0].value = 1;
   input.get_mutable_struct_array()[1].value = 2;
   input.get_mutable_struct_map()["hello"] = NestedStructWithTraitsImpl(1024);
   input.get_mutable_struct_map()["world"] = NestedStructWithTraitsImpl(2048);
 
-  mojo::Array<uint8_t> data = StructWithTraits::Serialize(&input);
+  auto data = StructWithTraits::Serialize(&input);
   StructWithTraitsImpl output;
   ASSERT_TRUE(StructWithTraits::Deserialize(std::move(data), &output));
 
   EXPECT_EQ(input.get_enum(), output.get_enum());
   EXPECT_EQ(input.get_bool(), output.get_bool());
   EXPECT_EQ(input.get_uint32(), output.get_uint32());
   EXPECT_EQ(input.get_uint64(), output.get_uint64());
   EXPECT_EQ(input.get_string(), output.get_string());
   EXPECT_EQ(input.get_string_array(), output.get_string_array());
   EXPECT_EQ(input.get_string_set(), output.get_string_set());
@@ skipping 71 matching lines @@
               quit_closure.Run();
 
             },
             loop.QuitClosure()));
     loop.Run();
   }
 }
 
 }  // namespace test
 }  // namespace mojo