GitLab

Move ExecuteGetCurrentWindowHandle() from session_commands.cc
to window_commands.cc, to make use of automatic window state
validation done for window commands.

Bug: chromedriver:1404
Change-Id: Id5ac4c7cea5323f12612b2dfb4dff2b819ce22ff
Reviewed-on: https://chromium-review.googlesource.com/1257362Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Tatiana Buldina <buldina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595938}