Reviewed by Yury Semikhatsky.

        Web Inspector: introduce a pair of set/remove methods for each breakpoint type.
        https://bugs.webkit.org/show_bug.cgi?id=50809

        * inspector/Inspector.idl:
        * inspector/InspectorController.cpp:
        (WebCore::InspectorController::InspectorController):
        (WebCore::InspectorController::setEventListenerBreakpoint):
        (WebCore::InspectorController::removeEventListenerBreakpoint):
        (WebCore::InspectorController::hasEventListenerBreakpoint):
        (WebCore::InspectorController::setXHRBreakpoint):
        (WebCore::InspectorController::removeXHRBreakpoint):
        (WebCore::InspectorController::hasXHRBreakpoint):
        (WebCore::InspectorController::clearNativeBreakpoints):
        * inspector/InspectorController.h:
        * inspector/InspectorDOMAgent.cpp:
        (WebCore::InspectorDOMAgent::setDOMBreakpoint):
        (WebCore::InspectorDOMAgent::removeDOMBreakpoint):
        (WebCore::InspectorDOMAgent::shouldBreakOnNodeInsertion):
        (WebCore::InspectorDOMAgent::shouldBreakOnNodeRemoval):
        (WebCore::InspectorDOMAgent::shouldBreakOnAttributeModification):
        (WebCore::InspectorDOMAgent::descriptionForDOMEvent):
        (WebCore::InspectorDOMAgent::didRemoveDOMNode):
        * inspector/InspectorDOMAgent.h:
        * inspector/InspectorInstrumentation.cpp:
        (WebCore::InspectorInstrumentation::willInsertDOMNodeImpl):
        (WebCore::InspectorInstrumentation::willRemoveDOMNodeImpl):
        (WebCore::InspectorInstrumentation::willModifyDOMAttrImpl):
        (WebCore::InspectorInstrumentation::willSendXMLHttpRequestImpl):
        (WebCore::InspectorInstrumentation::pauseOnNativeEventIfNeeded):
        * inspector/front-end/BreakpointManager.js:
        (WebInspector.BreakpointManager):
        (WebInspector.NativeBreakpoint):
        (WebInspector.DOMBreakpoint):
        (WebInspector.EventListenerBreakpoint):
        (WebInspector.XHRBreakpoint):
        * inspector/front-end/CallStackSidebarPane.js:
        (WebInspector.CallStackSidebarPane):
        (WebInspector.CallStackSidebarPane.prototype._nativeBreakpointHit):
        * inspector/front-end/DebuggerModel.js:
        (WebInspector.DebuggerModel.prototype.debuggerPaused):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@73726 268f45cc-cd09-0410-ab3c-d52691b4dbfc