EasyUnlock: Only do Bluetooth detection for chromeos.

chrome/browser/signin/easy_unlock_service.cc

Index: chrome/browser/signin/easy_unlock_service.cc
diff --git a/chrome/browser/signin/easy_unlock_service.cc b/chrome/browser/signin/easy_unlock_service.cc
index c07f85bc75048f72685b024f22adad0cf5707d35..d19df7f788464cadca348524c7f9e84824588416 100644
--- a/chrome/browser/signin/easy_unlock_service.cc
+++ b/chrome/browser/signin/easy_unlock_service.cc
@@ -290,7 +290,13 @@ void EasyUnlockService::Initialize() {
       base::Bind(&EasyUnlockService::OnPrefsChanged, base::Unretained(this)));
   OnPrefsChanged();
 
+#if defined(OS_CHROMEOS)
+  // Only starts Bluetooth detection for ChromeOS since the feature is

[Ilya Sherman, 2014/08/22 01:27:19]

nit: starts -> start

[xiyuan, 2014/08/22 03:18:56]

Done.

+  // only offered at ChromeOS. Note that http://crbug.com/404482 should be

[Ilya Sherman, 2014/08/22 01:27:19]

nit: at -> on

[xiyuan, 2014/08/22 03:18:56]

Done.

+  // checked and make sure we don't regress when re-enabling this,

[Ilya Sherman, 2014/08/22 01:27:19]

nit: "Enabling this on non-ChromeOS platforms previously introduced a
performance regression: http://crbug.com/NNNNNN.  Make sure not to reintroduce a
performance regression if re-enabling on additional platforms."

[xiyuan, 2014/08/22 03:18:56]

Done.

+  // TODO(xiyuan): Revisit when non-chromeos platforms are supported.
   bluetooth_detector_->Initialize();
+#endif  // defined(OS_CHROMEOS)
 }
 
 void EasyUnlockService::LoadApp() {