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

mojo/public/cpp/application/tests/service_provider_impl_unittest.cc

 // Copyright 2016 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/application/service_provider_impl.h"
 
 #include <utility>
 
+#include "gtest/gtest.h"
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/application/service_provider.mojom.h"
 #include "mojo/public/interfaces/bindings/tests/ping_service.mojom.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace {
 
 class ServiceProviderImplTest : public testing::Test {
  public:
   ServiceProviderImplTest() {}
   ~ServiceProviderImplTest() override { loop_.RunUntilIdle(); }
 
   RunLoop& loop() { return loop_; }
@@ skipping 317 matching lines @@
                            InterfaceRequest<ServiceProvider>());
   EXPECT_EQ(ConnectionContext::Type::UNKNOWN, impl.connection_context().type);
   EXPECT_EQ(std::string(), impl.connection_context().remote_url);
   EXPECT_EQ(std::string(), impl.connection_context().connection_url);
 }
 
 // TODO(vtl): Explicitly test |AddServiceForName()|?
 
 }  // namespace
 }  // namespace mojo