Enable Device Motion API on all platforms by default.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 43b7377efddbaf3a3f58ced41f122baf8a0643f8..bbef56f180ddf9b17ca3aeefe2f6d9c55168c76f 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6625,12 +6625,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_DISABLE_APP_LIST_DESCRIPTION" desc="Description of the flag to disable the app list on startup.">
         Disable the app launcher on startup. While this flag is set the launcher will be disabled every time Chrome starts. This is used for testing the app launcher install flow.
       </message>
-      <message name="IDS_FLAGS_ENABLE_DEVICE_MOTION_NAME" desc="Name of the flag to enable device motion DOM events.">
-        Enable device motion.
-      </message>
-      <message name="IDS_FLAGS_ENABLE_DEVICE_MOTION_DESCRIPTION" desc="Description for the flag to enable device motion.">
-        Enables device motion DOM events in JavaScript.
-      </message>
       <message name="IDS_FLAGS_DISABLE_USER_IMAGE_SYNC_NAME" desc="Name of the flag to disable sync of user account image.">
         Disable avatar sync.
       </message>