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

mojo/public/cpp/bindings/tests/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/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 {
 
 class MinimalInterfaceImpl : public test::MinimalInterface {
  public:
   MinimalInterfaceImpl() {}
 
   void Message() override { call_count_++; }
 
@@ skipping 74 matching lines @@
 
   // Check that the call counts are the same as before.
   for (size_t i = 0; i < kNumObjects; i++) {
     int expected = (i < kNumObjects / 2 ? 1 : 2);
     EXPECT_EQ(expected, impls[i].call_count());
   }
 }
 
 }  // namespace
 }  // namespace mojo