https://bugs.webkit.org/show_bug.cgi?id=97807

Reviewed by Adam Barth.

Follow-up of 97688. Introduces proper test coverage for the find-in-page
feature in detaching/detached frame situations, fixing a few crashes and
ensuring that a final reply is always sent.

* public/WebNode.h:
* src/WebFrameImpl.cpp:
(WebKit::WebFrameImpl::find):
(WebKit::WebFrameImpl::scopeStringMatches):
(WebKit::WebFrameImpl::flushCurrentScopingEffort):
(WebKit):
(WebKit::WebFrameImpl::finishCurrentScopingEffort):
(WebKit::WebFrameImpl::cancelPendingScopingEffort):
(WebKit::WebFrameImpl::WebFrameImpl):
(WebKit::WebFrameImpl::setWebCoreFrame):
(WebKit::WebFrameImpl::initializeAsMainFrame):
(WebKit::WebFrameImpl::createChildFrame):
(WebKit::WebFrameImpl::shouldScopeMatches):
(WebKit::WebFrameImpl::willDetachPage):
* src/WebFrameImpl.h:
(WebFrameImpl):
* src/WebNode.cpp:
(WebKit::WebNode::remove):
(WebKit):
* tests/WebFrameTest.cpp:
* tests/data/find_in_page.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129910 268f45cc-cd09-0410-ab3c-d52691b4dbfc