Merge 133569 - Web Inspector: JavaScript web workers debugging crashes

Merge 133569 - Web Inspector: JavaScript web workers debugging crashes
https://bugs.webkit.org/show_bug.cgi?id=101065

Reviewed by Alexander Pavlov.

Source/WebCore:

Clear m_pageInspector when page inspector instance is deleted.
Disable worker inspection when front-end disconnects.

Test: inspector-protocol/debugger-terminate-dedicated-worker-while-paused.html

* inspector/InspectorWorkerAgent.cpp:
(WebCore::InspectorWorkerAgent::WorkerFrontendChannel::~WorkerFrontendChannel): notify
WorkerMessagingProxy so that it can clear pointer to the channel.

LayoutTests:

Test that inspected page won't crash if inspected worker is terminated when it is paused
on a breakpoint.

* inspector-protocol/debugger-terminate-dedicated-worker-while-paused-expected.txt: Added.
* inspector-protocol/debugger-terminate-dedicated-worker-while-paused.html: Added.
* platform/efl/TestExpectations:
* platform/gtk/TestExpectations:
* platform/mac/TestExpectations:
* platform/qt/TestExpectations:
* platform/win/TestExpectations:
* platform/wincairo/TestExpectations:

TBR=yurys@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=134370