Do not create a pending entry for windows opened by DOM.

Creating a pending entry is cruft code from UIWebView world. This
pending invalid new entry is later updated by
NavigationManager::UpdatePendingItemUrl, which is also cruft code from
UIWebView world.

The problem is that NavigationManager::UpdatePendingItemUrl does not
always work correctly and causes (crbug.com/805900). It is necessary to
stop creating an invalid pending entry before removing
NavigationManager::UpdatePendingItemUrl.

Bug: 805900
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If478c574f11e5e586fac7407085f57ec05079814
Reviewed-on: https://chromium-review.googlesource.com/899700
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534594}
3 files changed