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Notable changes:
 - updated testLinkWithBlankTargetWithoutUserGesture to execute script
   without user gesture
 - removed NavigationActionInitiationType::kScriptInitiated because there
   is no way to tell if action was initiated by the script (coordinates or
   SyntheticClickType can be 0 for valid link clicks).
 - Updated webView:createWebViewWithConfiguration: to use
   GetNavigationActionInitiationTypeWithVoiceOverOn, because there is no
   need to inspect action.description when Voice over is Off.
   -userIsInteracting can give false positives for link clicks, which is
   ok. window.open also have these false positives, so if the page wants
   to open a popup, it can exploit window.open.

Bug: 849749
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8c179c9df2d6bce3253e46272c2f14e0eb6224bc
Reviewed-on: https://chromium-review.googlesource.com/1087389
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565442}