Remove the dependence of Editor::Command in SelectionController.cpp.

Use Editor::ExecuteCommand() instead of Editor::CreateCommand().Execute()
to avoid the dependence of Editor::Command in SelectionController.cpp
Signed-off-by: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Change-Id: I3d0a46689014d7a059d2df56c7bb9d4299ed219f
Reviewed-on: https://chromium-review.googlesource.com/964026Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543330}

third_party/WebKit/Source/core/editing/SelectionController.cpp

@@ -1178,9 +1178,8 @@ bool SelectionController::HandlePasteGlobalSelection(
   Frame* focus_frame =
       frame_->GetPage()->GetFocusController().FocusedOrMainFrame();
   // Do not paste here if the focus was moved somewhere else.
-  if (frame_ == focus_frame &&
-      frame_->GetEditor().Behavior().SupportsGlobalSelection())
-    return frame_->GetEditor().CreateCommand("PasteGlobalSelection").Execute();
+  if (frame_ == focus_frame)
+    return frame_->GetEditor().ExecuteCommand("PasteGlobalSelection");
 
   return false;
 }