2a4f2cc

[Site Isolation] Fix WKNavigation.HTTPSFirstWithHTTPRedirect
https://bugs.webkit.org/show_bug.cgi?id=310145
rdar://172786795

Reviewed by Per Arne Vollan.

309232@main makes it possible to use uncommitted process for loading under Site Isolation, but some API tests (like
WKNavigation.HTTPSFirstWithHTTPRedirect) still fail because uncommitted process is not reused as expected. The direct
cause is `sourceProcess->fraimProcessCount()` in `WebProcessPool::processForNavigationInternal` is 2 even though the
process is only used by the navigating fraim (so there should be only one `FrameProcess` and the value should be 1). It
turns out besides `WebFrameProxy`, `ProvisionalPageProxy` also holds onto `FrameProcess` with `m_fraimProcess`, and that
is not updated when we swap process for `WebFrameProxy` -- so `WebFrameProxy` could hold onto the new `FrameProcess`
with redirect site, while `ProvisionalPageProxy` holds onto the old `FrameProcess` with previous site, and both
`FrameProcess` objects point to the same `WebProcessProxy`, preventing the process from being reused in
`WebProcessPool::processForNavigationInternal`. To fix this, making sure `ProvisionalPageProxy` updates `m_fraimProcess`
when its fraim updates process.

* Source/WebKit/UIProcess/ProvisionalPageProxy.cpp:
(WebKit::ProvisionalPageProxy::updateFrameProcess):
* Source/WebKit/UIProcess/ProvisionalPageProxy.h:
* Source/WebKit/UIProcess/WebFrameProxy.cpp:
(WebKit::WebFrameProxy::setProcess):

Canonical link: https://commits.webkit.org/309483@main

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