[ChromeDriver] ChromeDriver 2.46 release

Change-Id: I09aabce82101f84ab652f5f1aa85d8662a2265e7
Reviewed-on: https://chromium-review.googlesource.com/c/1450293Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Artur Khachatryan <khachatryan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628377}

chrome/test/chromedriver/VERSION

-2.45
+2.46