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This CL adds kNewPassKitDownload and kNewFileDownload flags usage
to the web layer. Turning on kNewPassKitDownload flag will disable
CRWPassKitDownloader and webController:didLoadPassKitObject: callback.
Turning on kNewFileDownload will disable
controllerForUnhandledContentAtURL: callback.
Turning either of these flags on will add a logic, which discards
pending item if that item is download.

Both flags are turned off by default and there is no way to enable
them via chrome://flags yet.

This CL slightly changes the code inside WKNavigationDelegate's
webView:decidePolicyForNavigationResponse:decisionHandler: as follows:
 - CRWPassKitDownloader download is moved behind |!allowNavigation|
 - allowNavigation is not set to no if MIME type is PassKit
These are non functional changes because if MIME type is PassKit, then
|allowNavigation| is always NO.

Bug: 780646
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I948ae3e1f38d266eda8aa7b99900900d8c02fef3
Reviewed-on: https://chromium-review.googlesource.com/783671
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Gregory Chatzinoff <gchatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519795}