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

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

 // Copyright 2014 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 <limits>
 
+#include "gtest/gtest.h"
 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h"
 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {
 namespace {
 
 bool IsZero(void* p_buf, size_t size) {
   char* buf = reinterpret_cast<char*>(p_buf);
   for (size_t i = 0; i < size; ++i) {
     if (buf[i] != 0)
       return false;
@@ skipping 70 matching lines @@
 
   // A lot too large, leading to possible integer overflow.
   EXPECT_EQ(reinterpret_cast<void*>(0),
             buf.Allocate(std::numeric_limits<size_t>::max() - 8u));
 }
 #endif
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo