Reviewed by Timothy Hatcher.

        Web Inspector: Do not use ContextMenuItem as value type in custom
        context menu implementation.

        https://bugs.webkit.org/show_bug.cgi?id=32411

        * GNUmakefile.am:
        * WebCore.gypi:
        * WebCore.pro:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * bindings/js/JSInspectorFrontendHostCustom.cpp:
        (WebCore::JSInspectorFrontendHost::showContextMenu):
        * inspector/InspectorFrontendHost.cpp:
        (WebCore::InspectorFrontendHost::InspectorFrontendHost):
        (WebCore::InspectorFrontendHost::~InspectorFrontendHost):
        (WebCore::InspectorFrontendHost::showContextMenu):
        (WebCore::InspectorFrontendHost::contextMenuCleared):
        * inspector/InspectorFrontendHost.h:
        (WebCore::InspectorFrontendHost::MenuProvider::create):
        (WebCore::InspectorFrontendHost::MenuProvider::~MenuProvider):
        (WebCore::InspectorFrontendHost::MenuProvider::disconnect):
        (WebCore::InspectorFrontendHost::MenuProvider::populateContextMenu):
        (WebCore::InspectorFrontendHost::MenuProvider::contextMenuCleared):
        (WebCore::InspectorFrontendHost::MenuProvider::MenuProvider):
        * page/ContextMenuController.cpp:
        (WebCore::ContextMenuController::ContextMenuController):
        (WebCore::ContextMenuController::clearContextMenu):
        (WebCore::ContextMenuController::showContextMenu):
        (WebCore::ContextMenuController::contextMenuItemSelected):
        * page/ContextMenuController.h:
        * page/ContextMenuProvider.h: Added.
        (WebCore::ContextMenuProvider::~ContextMenuProvider):
        * page/ContextMenuSelectionHandler.h: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51993 268f45cc-cd09-0410-ab3c-d52691b4dbfc