[GTK][WK2] Move Vector objects into WebEditorClient::executePendingEditorCommands() invocations
https://bugs.webkit.org/show_bug.cgi?id=131454

Reviewed by Carlos Garcia Campos.

* WebProcess/WebCoreSupport/WebEditorClient.h:
* WebProcess/WebCoreSupport/gtk/WebEditorClientGtk.cpp:
(WebKit::WebEditorClient::executePendingEditorCommands): Take a const reference of the Vector
object to avoid unnecessary copies. Also deploy two range-based for loops and efficiently move
the Editor::Command objects into the other Vector.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@167116 268f45cc-cd09-0410-ab3c-d52691b4dbfc