Stale frame in WebCore::SpellChecker::didCheckSucceeded

Source/WebCore:

Reviewed by Ryosuke Niwa.

Added EditorClient::frameWillDetachPage() notification to give a
change to invalidate pending spellcheck requests on the client.

Test: editing/spelling/spellcheck-async-remove-frame.html

* editing/Editor.cpp:
(WebCore::Editor::Editor):
* editing/Editor.h:
(Editor):
* loader/EmptyClients.h:
(WebCore::EmptyEditorClient::frameWillDetachPage):
* page/EditorClient.h:
(EditorClient):

Source/WebKit/blackberry:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/EditorClientBlackBerry.h:
(WebCore::EditorClientBlackBerry::frameWillDetachPage):

Source/WebKit/chromium:

Added WebTextCheckingCompletionImpl::invalidate() to mark
pending spellcheck request as invalid, and added frameWillDetachPage()
to fire it.

Reviewed by Ryosuke Niwa.

* src/EditorClientImpl.cpp:
(WebKit::EditorClientImpl::frameWillDetachPage):
(WebKit):
(WebKit::EditorClientImpl::requestCheckingOfString):
(WebKit::EditorClientImpl::didCheckString):
* src/EditorClientImpl.h:
(WebKit):
(EditorClientImpl):
* src/WebTextCheckingCompletionImpl.cpp:
(WebKit::WebTextCheckingCompletionImpl::didFinishCheckingText):
(WebKit::WebTextCheckingCompletionImpl::didCancelCheckingText):
(WebKit::WebTextCheckingCompletionImpl::invalidate):
(WebKit):
* src/WebTextCheckingCompletionImpl.h:
(WebKit):
(WebKit::WebTextCheckingCompletionImpl::WebTextCheckingCompletionImpl):
(WebTextCheckingCompletionImpl):
(WebKit::WebTextCheckingCompletionImpl::spellChecker):

Source/WebKit/efl:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/EditorClientEfl.h:
(WebCore::EditorClientEfl::frameWillDetachPage):

Source/WebKit/gtk:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/EditorClientGtk.h:
(WebKit::EditorClient::frameWillDetachPage):

Source/WebKit/mac:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/WebEditorClient.h:

Source/WebKit/qt:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/EditorClientQt.h:
(WebCore::EditorClientQt::frameWillDetachPage):

Source/WebKit/win:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/WebEditorClient.h:
(WebEditorClient::frameWillDetachPage):

Source/WebKit/wince:

Reviewed by Ryosuke Niwa.

* WebCoreSupport/EditorClientWinCE.h:
(WebKit::EditorClientWinCE::frameWillDetachPage):

Source/WebKit/wx:

Reviewed by Ryosuke Niwa.

* WebKitSupport/EditorClientWx.h:
(WebCore::EditorClientWx::frameWillDetachPage):

LayoutTests:

Reviewed by Ryosuke Niwa.

* editing/spelling/spellcheck-async-remove-frame-expected.txt: Added.
* editing/spelling/spellcheck-async-remove-frame.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117572 268f45cc-cd09-0410-ab3c-d52691b4dbfc