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

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

Index: mojo/public/cpp/bindings/tests/equals_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/equals_unittest.cc b/mojo/public/cpp/bindings/tests/equals_unittest.cc
index efac86bcdeb3695297115969d38d4d914bde5cf9..3468a2c92afbe9007cafc42325de87fd0b4e55e8 100644
--- a/mojo/public/cpp/bindings/tests/equals_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/equals_unittest.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "gtest/gtest.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace test {