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

mojo/public/cpp/environment/tests/run_loop_async_wait_perftest.cc

Index: mojo/public/cpp/environment/tests/run_loop_async_wait_perftest.cc
diff --git a/mojo/public/cpp/environment/tests/run_loop_async_wait_perftest.cc b/mojo/public/cpp/environment/tests/run_loop_async_wait_perftest.cc
index 8a8dd73a984b671e6fd70baf4c38504b9870a79a..f809a8e4ee24b5ebfcb490b065ed4dfa4840f1a2 100644
--- a/mojo/public/cpp/environment/tests/run_loop_async_wait_perftest.cc
+++ b/mojo/public/cpp/environment/tests/run_loop_async_wait_perftest.cc
@@ -7,11 +7,11 @@
 
 #include <stdio.h>
 
+#include "gtest/gtest.h"
 #include "mojo/public/c/tests/environment/async_waiter_perftest_helpers.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/test_support/test_support.h"
 #include "mojo/public/cpp/utility/run_loop.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace {