Move IsRunningOnChromeOS to base/chromeos so that ui/, /chromeos and other components can use it.

plus, a couple of cleanups including
 - removed unnecessary includes
 - removed unnecessary ifdef chromeos in chromeos only code.

BUG=115967
TEST=none

Review URL: http://codereview.chromium.org/9546013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@127283 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 45 insertions, 0 deletions

diff --git a/base/chromeos/chromeos_version.cc b/base/chromeos/chromeos_version.cc
new file mode 100644
index 0000000..4a70cd5
--- /dev/null
+++ b/base/chromeos/chromeos_version.cc
@@ -0,0 +1,24 @@
+// Copyright (c) 2012 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 "base/chromeos/chromeos_version.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "base/logging.h"
+
+namespace base {
+namespace chromeos {
+
+bool IsRunningOnChromeOS() {
+  // Check if the user name is chronos. Note that we don't go with
+  // getuid() + getpwuid_r() as it may end up reading /etc/passwd, which
+  // can be expensive.
+  const char* user = getenv("USER");
+  return user && strcmp(user, "chronos") == 0;
+}
+
+}  // namespace chromeos
+}  // namespace base
diff --git a/base/chromeos/chromeos_version.h b/base/chromeos/chromeos_version.h
new file mode 100644
index 0000000..fc4b242
--- /dev/null
+++ b/base/chromeos/chromeos_version.h
@@ -0,0 +1,21 @@
+// Copyright (c) 2012 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.
+
+#ifndef BASE_CHROMEOS_CHROMEOS_VERSION_H_
+#define BASE_CHROMEOS_CHROMEOS_VERSION_H_
+#pragma once
+
+#include "base/base_export.h"
+
+namespace base {
+namespace chromeos {
+
+// Returns true if the browser is running on Chrome OS.
+// Useful for implementing stubs for Linux desktop.
+BASE_EXPORT bool IsRunningOnChromeOS();
+
+}  // namespace chromeos
+}  // namespace base
+
+#endif  // BASE_CHROMEOS_CHROMEOS_VERSION_H_