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

mojo/public/c/tests/bindings/array_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.
 
 // TODO(vardhan): Needs a lot more testing.
 
 #include <mojo/bindings/array.h>
 
 #include <mojo/bindings/struct.h>
 #include <stddef.h>
 
+#include "gtest/gtest.h"
 #include "mojo/public/c/tests/bindings/testing_util.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom-c.h"
 #include "mojo/public/interfaces/bindings/tests/test_unions.mojom-c.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 // Tests MojomArray_New().
 TEST(ArrayTest, New) {
   char bytes_buffer[1000];
   struct MojomBuffer buf = {bytes_buffer, sizeof(bytes_buffer), 0};
 
   struct MojomArrayHeader* arr = NULL;
   arr = MojomArray_New(&buf, 3, sizeof(uint32_t));
@@ skipping 258 matching lines @@
     EXPECT_EQ(static_cast<MojoHandle>(20u),
               *MOJOM_ARRAY_INDEX(copied_struct->array_h.ptr, MojoHandle, 0));
     EXPECT_EQ(MOJO_HANDLE_INVALID,
               *MOJOM_ARRAY_INDEX(copied_struct->array_h.ptr, MojoHandle, 1));
     EXPECT_EQ(static_cast<MojoHandle>(30u),
               *MOJOM_ARRAY_INDEX(copied_struct->array_h.ptr, MojoHandle, 2));
   }
 }
 
 }  // namespace