Move ash/system/network to ash/system/chromeos

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 837402bfb16d289b2cc180b8a19e791ae59dad67..bbaad344df3192162bb6272801e413f80c28354d 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -160,6 +160,13 @@
         'system/brightness/brightness_control_delegate.h',
         'system/brightness/tray_brightness.cc',
         'system/brightness/tray_brightness.h',
+        'system/chromeos/network/network_observer.h',
+        'system/chromeos/network/tray_network.cc',
+        'system/chromeos/network/tray_network.h',
+        'system/chromeos/network/tray_sms.cc',
+        'system/chromeos/network/tray_sms.h',
+        'system/chromeos/tray_display.cc',
+        'system/chromeos/tray_display.h',
         'system/date/clock_observer.h',
         'system/date/date_view.cc',
         'system/date/date_view.h',
@@ -174,11 +181,6 @@
         'system/keyboard_brightness/keyboard_brightness_control_delegate.h',
         'system/locale/tray_locale.cc',
         'system/locale/tray_locale.h',
-        'system/network/network_observer.h',
-        'system/network/tray_network.cc',
-        'system/network/tray_network.h',
-        'system/network/tray_sms.cc',
-        'system/network/tray_sms.h',
         'system/power/power_status_observer.h',
         'system/power/power_status_view.cc',
         'system/power/power_status_view.h',
@@ -228,8 +230,6 @@
         'system/tray_accessibility.h',
         'system/tray_caps_lock.cc',
         'system/tray_caps_lock.h',
-        'system/tray_display.cc',
-        'system/tray_display.h',
         'system/tray_update.cc',
         'system/tray_update.h',
         'system/user/login_status.h',