mojo/public: Include gtest.h as "gtest/gtest.h", instead of via "absolute" path.

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

 // Copyright 2016 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 <sstream>
 
+#include "gtest/gtest.h"
 #include "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/formatting.h"
 #include "mojo/public/cpp/bindings/map.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 RectPtr MakeRect(int32_t factor = 1) {
   RectPtr rect(Rect::New());
   rect->x = 1 * factor;
   rect->y = 2 * factor;
   rect->width = 10 * factor;
   rect->height = 20 * factor;
@@ skipping 73 matching lines @@
   EXPECT_EQ(
       "inlined_struct_ptr={x=1, y=2, width=10, height=20}, "
       "null_inlined_struct_ptr=null, "
       "struct_ptr={first={x=2, y=4, width=20, height=40}, second=null}, "
       "null_struct_ptr=null",
       so.str());
 }
 
 }  // namespace test
 }  // namespace mojo