Standardize usage of virtual/override/final in storage/

storage/browser/fileapi/copy_or_move_operation_delegate.cc

Index: storage/browser/fileapi/copy_or_move_operation_delegate.cc
diff --git a/storage/browser/fileapi/copy_or_move_operation_delegate.cc b/storage/browser/fileapi/copy_or_move_operation_delegate.cc
index a1e212bec8502bfff62719d64a0ed76bc64c0997..5b1d7d2238597f81b7830647e6c8f8dc151e0790 100644
--- a/storage/browser/fileapi/copy_or_move_operation_delegate.cc
+++ b/storage/browser/fileapi/copy_or_move_operation_delegate.cc
@@ -60,7 +60,7 @@ class CopyOrMoveOnSameFileSystemImpl
         file_progress_callback_(file_progress_callback) {
   }
 
-  virtual void Run(
+  void Run(
       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
     if (operation_type_ == CopyOrMoveOperationDelegate::OPERATION_MOVE) {
       operation_runner_->MoveFileLocal(src_url_, dest_url_, option_, callback);
@@ -70,7 +70,7 @@ class CopyOrMoveOnSameFileSystemImpl
     }
   }
 
-  virtual void Cancel() override {
+  void Cancel() override {
     // We can do nothing for the copy/move operation on a local file system.
     // Assuming the operation is quickly done, it should be ok to just wait
     // for the completion.
@@ -113,7 +113,7 @@ class SnapshotCopyOrMoveImpl
         weak_factory_(this) {
   }
 
-  virtual void Run(
+  void Run(
       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
     file_progress_callback_.Run(0);
     operation_runner_->CreateSnapshotFile(
@@ -122,9 +122,7 @@ class SnapshotCopyOrMoveImpl
                    weak_factory_.GetWeakPtr(), callback));
   }
 
-  virtual void Cancel() override {
-    cancel_requested_ = true;
-  }
+  void Cancel() override { cancel_requested_ = true; }
 
  private:
   void RunAfterCreateSnapshot(
@@ -388,7 +386,7 @@ class StreamCopyOrMoveImpl
         cancel_requested_(false),
         weak_factory_(this) {}
 
-  virtual void Run(
+  void Run(
       const CopyOrMoveOperationDelegate::StatusCallback& callback) override {
     // Reader can be created even if the entry does not exist or the entry is
     // a directory. To check errors before destination file creation,
@@ -399,7 +397,7 @@ class StreamCopyOrMoveImpl
                    weak_factory_.GetWeakPtr(), callback));
   }
 
-  virtual void Cancel() override {
+  void Cancel() override {
     cancel_requested_ = true;
     if (copy_helper_)
       copy_helper_->Cancel();