Clean up most of the ChromeOS headers in non-ChromeOS build

chrome/browser/diagnostics/diagnostics_controller_unittest.cc

 // Copyright 2013 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 "chrome/browser/diagnostics/diagnostics_controller.h"
 
 #include <memory>
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "build/build_config.h"
 #include "chrome/browser/diagnostics/diagnostics_model.h"
 #include "chrome/browser/diagnostics/diagnostics_writer.h"
 #include "chrome/browser/diagnostics/sqlite_diagnostics.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if defined(OS_CHROMEOS)
 #include "chromeos/chromeos_constants.h"
-#include "testing/gtest/include/gtest/gtest.h"
+#endif  // defined(OS_CHROMEOS)
 
 namespace diagnostics {
 
 // Basic harness to acquire and release the required temporary environment to
 // run a test in.
 class DiagnosticsControllerTest : public testing::Test {
  protected:
   DiagnosticsControllerTest() : cmdline_(base::CommandLine::NO_PROGRAM) {}
 
   ~DiagnosticsControllerTest() override {}
@@ skipping 121 matching lines @@
   EXPECT_EQ(DiagnosticsModel::TEST_FAIL_CONTINUE, info->GetResult());
   EXPECT_EQ(DIAG_SQLITE_ERROR_HANDLER_CALLED, info->GetOutcomeCode());
 
   DiagnosticsController::GetInstance()->RunRecovery(cmdline_, writer_.get());
   EXPECT_EQ(DiagnosticsModel::RECOVERY_OK, info->GetResult());
   EXPECT_FALSE(base::PathExists(db_path));
 }
 #endif
 
 }  // namespace diagnostics