Files.app: Start to use DeviceEventRouter.

chrome/common/extensions/api/file_browser_private.idl

Index: chrome/common/extensions/api/file_browser_private.idl
diff --git a/chrome/common/extensions/api/file_browser_private.idl b/chrome/common/extensions/api/file_browser_private.idl
index 5efd19a0ac36f09309a49dc99d86d6766e0ea809..91e0d1cd3ede323e5671927fddef9bc6a4e0dc93 100644
--- a/chrome/common/extensions/api/file_browser_private.idl
+++ b/chrome/common/extensions/api/file_browser_private.idl
@@ -98,14 +98,12 @@ enum InspectionType {
 
 // Device event type.
 enum DeviceEventType {
-  // Device is added.
-  added,
-  // If the device is disabled by preference, the disabled event is published
-  // instead of the added event.
+  // Device scan is started.
+  scan_started,
+  // Device scan is cancelled.
+  scan_cancelled,
+  // If the device is disabled by preference.
   disabled,
-  // Device is added, but scan for the device is canceled. The event is
-  // published after the added event.
-  scan_canceled,
   // Device is removed.
   removed,
   // Device is hard unplugged.
@@ -299,10 +297,7 @@ dictionary MountCompletedEvent {
   // Metadata of the mounted volume.
   VolumeMetadata volumeMetadata;
 
-  // Whether it is remount or not.
-  boolean isRemounting;
-
-  // Whether the volume should be opend by Files.app or not.
+  // Whether the volume event should be notified or not.
   boolean shouldNotify;
 };