drive: Remove unused DriveServiceInterface::TouchResource

chrome/browser/drive/drive_service_interface.h

Index: chrome/browser/drive/drive_service_interface.h
diff --git a/chrome/browser/drive/drive_service_interface.h b/chrome/browser/drive/drive_service_interface.h
index deeaf2b92545d652fc7a68eafb0ebb4643a67f6e..e443c5cf4058ae504f60295ccc5050246f5cd87e 100644
--- a/chrome/browser/drive/drive_service_interface.h
+++ b/chrome/browser/drive/drive_service_interface.h
@@ -256,17 +256,6 @@ class DriveServiceInterface {
       const std::string& new_title,
       const google_apis::EntryActionCallback& callback) = 0;
 
-  // Touches the resource with |resource_id|.
-  // Its modifiedDate and lastViewedByMeDate fields on the server will be
-  // updated to |modified_date| and |last_viewed_by_me_date| respectively.
-  // Upon completion, invokes |callback| with the updated resource data.
-  // |modified_date|, |last_viewed_by_me_date| and |callback| must not be null.
-  virtual google_apis::CancelCallback TouchResource(
-      const std::string& resource_id,
-      const base::Time& modified_date,
-      const base::Time& last_viewed_by_me_date,
-      const google_apis::GetResourceEntryCallback& callback) = 0;
-
   // Adds a resource (document, file, or collection) identified by its
   // |resource_id| to a collection represented by the |parent_resource_id|.
   // Upon completion, invokes |callback| with results on the calling thread.