Use no-cache fetch mode when loading main documents with location.reload()

Use no-cache fetch mode when loading main documents with location.reload()
https://bugs.webkit.org/show_bug.cgi?id=181285
LayoutTests/imported/w3c:

Patch by Youenn Fablet <youenn@apple.com> on 2018-01-10
Reviewed by Alex Christensen.

* web-platform-tests/service-workers/service-worker/fetch-event.https-expected.txt:

Source/WebCore:

Patch by Youenn Fablet <youenn@apple.com> on 2018-01-10
Reviewed by Alex Christensen.

Covered by rebased tests.

Start to translate cache policy used for navigation as FetchOptions::Cache.
This allows ensuring service workers receive the right cache mode when intercepting navigation loads.
To not change current navigation behavior, ReturnCacheDataElseLoad and ReturnCacheDataDontLoad still trigger default fetch cache mode.

For Reload and ReloadExpiredOnly frame load types, using no-cache mode is more efficient than reload mode,
as a conditional request will be sent if possible. This applies to location.reload which is consistent with other browsers.
Keep reload mode for ReloadFromOrigin.

* loader/DocumentLoader.cpp:
(WebCore::toFetchOptionsCache):
(WebCore::DocumentLoader::loadMainResource):
* loader/FrameLoader.cpp:
(WebCore::FrameLoader::loadFrameRequest):
(WebCore::FrameLoader::loadURL):
(WebCore::FrameLoader::load):
(WebCore::FrameLoader::reload):
(WebCore::FrameLoader::defaultRequestCachingPolicy):
(WebCore::FrameLoader::loadDifferentDocumentItem):
* loader/NavigationScheduler.cpp:

LayoutTests:

<rdar://problem/36356831>

Patch by Youenn Fablet <youenn@apple.com> on 2018-01-10
Reviewed by Alex Christensen.

* http/tests/inspector/network/har/har-page-expected.txt:
* http/tests/inspector/network/har/har-page.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@226745 268f45cc-cd09-0410-ab3c-d52691b4dbfc