Bug 247395

We get crashes like:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
 0  WebKit           	       0x1a434f6c0 void WebKit::WebProcessPool::sendToAllProcessesForSession<Messages::WebProcess::SetResourceLoadStatisticsEnabled>(Messages::WebProcess::SetResourceLoadStatisticsEnabled const&, PAL::SessionID) + 156 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.h:132
 1  WebKit           	       0x1a434f40c WebKit::WebsiteDataStore::setResourceLoadStatisticsEnabled(bool) + 168 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:1605
 2  WebKit           	       0x1a434f40c WebKit::WebsiteDataStore::setResourceLoadStatisticsEnabled(bool) + 168 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:1605
 3  WebKit           	       0x1a42569e8 WebKit::WebProcessPool::createNewWebProcess(WebKit::WebsiteDataStore*, WebKit::WebProcessProxy::CaptivePortalMode, WebKit::WebProcessProxy::IsPrewarmed, WebCore::CrossOriginMode) + 92 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/WebProcessPool.cpp:629
 4  WebKit           	       0x1a4239648 WebKit::WebProcessPool::processForRegistrableDomain(WebKit::WebsiteDataStore&, WebCore::RegistrableDomain const&, WebKit::WebProcessProxy::CaptivePortalMode) + 888 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/WebProcessPool.cpp:1052
 5  WebKit           	       0x1a427239c WebKit::WebProcessPool::createWebPage(WebKit::PageClient&, WTF::Ref<API::PageConfiguration, WTF::RawPtrTraits<API::PageConfiguration> >&&) + 276 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/WebProcessPool.cpp:1098
 6  WebKit           	       0x1a3c1a6a0 -[WKContentView _commonInitializationWithProcessPool:configuration:] + 68 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/ios/WKContentView.mm:172
 7  WebKit           	       0x1a3c1a630 -[WKContentView initWithFrame:processPool:configuration:webView:] + 164 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/ios/WKContentView.mm:297
 8  WebKit           	       0x1a3c18adc -[WKWebView _initializeWithConfiguration:] + 1096 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:386
 9  WebKit           	       0x1a3c18680 -[WKWebView initWithFrame:configuration:] + 72 /Library/Caches/com.apple.xbs/Sources/WebKit/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:586
 10  SafariSharedUI   	       0x1b18d0b70 __100-[WBSSiteMetadataManager siteMetadataProvider:getWebViewOfSize:withConfiguration:completionHandler:]_block_invoke + 56 /Library/Caches/com.apple.xbs/Sources/SafariShared/SafariShared/SiteMetadataManager/WBSSiteMetadataManager.m:784
 11  SafariSharedUI   	       0x1b18d0aec -[WBSSiteMetadataManager siteMetadataProvider:getWebViewOfSize:withConfiguration:completionHandler:] + 712 /Library/Caches/com.apple.xbs/Sources/SafariShared/SafariShared/SiteMetadataManager/WBSSiteMetadataManager.m:790
 12  SafariSharedUI   	       0x1b18e4818 -[WBSTouchIconCache webViewMetadataFetchOperation:getWebViewOfSize:withConfiguration:completionHandler:] + 100 /Library/Caches/com.apple.xbs/Sources/SafariShared/SafariShared/SiteMetadataManager/WBSTouchIconCache.mm:1008
 13  SafariSharedUI   	       0x1b190aeb8 -[WBSWebViewMetadataFetchOperation _setUpWebViewAndStartOffscreenFetching] + 216 /Library/Caches/com.apple.xbs/Sources/SafariShared/SafariShared/SiteMetadataManager/WBSWebViewMetadataFetchOperation.m:52
 14  libdispatch.dylib	       0x1980d14b4 _dispatch_call_block_and_release + 32 /Library/Caches/com.apple.xbs/Sources/libdispatch/src/init.c:1518
 15  libdispatch.dylib	       0x1980d2fdc _dispatch_client_callout + 20 /Library/Caches/com.apple.xbs/Sources/libdispatch/src/object.m:560
 16  libdispatch.dylib	       0x1980e17f4 _dispatch_main_queue_drain + 928 /Library/Caches/com.apple.xbs/Sources/libdispatch/src/inline_internal.h:2632
 17  libdispatch.dylib	       0x1980e1444 _dispatch_main_queue_callback_4CF + 44 /Library/Caches/com.apple.xbs/Sources/libdispatch/src/queue.c:7887
 18  CoreFoundation   	       0x190b566d8 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16 /Library/Caches/com.apple.xbs/Sources/CoreFoundation/CoreFoundation/RunLoop.subproj/CFRunLoop.c:1780
 19  CoreFoundation   	       0x190b3803c __CFRunLoopRun + 2036 /Library/Caches/com.ap

The problem is that the WebProcessProxy for a crashing WebProcess doesn't have a WebsiteDataStore associated with it, so we can't get a SessionID for matching in sendToAllProcessesForSession().