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

mojo/public/cpp/bindings/tests/strong_binding_set_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 "mojo/public/cpp/bindings/strong_binding_set.h"
 
+#include "gtest/gtest.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/bindings/tests/minimal_interface.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace common {
 namespace {
 
 class MinimalInterfaceImpl : public test::MinimalInterface {
  public:
   explicit MinimalInterfaceImpl(bool* deleted_flag)
       : deleted_flag_(deleted_flag) {}
   ~MinimalInterfaceImpl() override { *deleted_flag_ = true; }
@@ skipping 84 matching lines @@
 
   // Check that all interfaces have all been deleted.
   for (size_t i = 0; i < kNumObjects; i++) {
     EXPECT_TRUE(deleted_flags[i]);
   }
 }
 
 }  // namespace
 }  // namespace common
 }  // namespace mojo