[DevTools] Migrate usages of Target to RuntimeModel where makes sense

third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js

 if (window.GCController)
     GCController.collectAll();
 
 var initialize_InspectorTest = function() {
 Protocol.InspectorBackend.Options.suppressRequestErrors = true;
 var results = [];
 
 function consoleOutputHook(messageType)
 {
     InspectorTest.addResult(messageType + ": " + Array.prototype.slice.call(arguments, 1));
@@ skipping 964 matching lines @@
         InspectorTest.InspectorAgent = target.inspectorAgent();
         InspectorTest.NetworkAgent = target.networkAgent();
         InspectorTest.PageAgent = target.pageAgent();
         InspectorTest.ProfilerAgent = target.profilerAgent();
         InspectorTest.RuntimeAgent = target.runtimeAgent();
         InspectorTest.TargetAgent = target.targetAgent();
 
         InspectorTest.networkManager = SDK.NetworkManager.fromTarget(target);
         InspectorTest.securityOriginManager = SDK.SecurityOriginManager.fromTarget(target);
         InspectorTest.resourceTreeModel = SDK.ResourceTreeModel.fromTarget(target);
-        InspectorTest.debuggerModel = SDK.DebuggerModel.fromTarget(target);
+        InspectorTest.debuggerModel = target.model(SDK.DebuggerModel);
         InspectorTest.runtimeModel = target.runtimeModel;
         InspectorTest.domModel = SDK.DOMModel.fromTarget(target);
         InspectorTest.cssModel = target.model(SDK.CSSModel);
         InspectorTest.powerProfiler = target.powerProfiler;
         InspectorTest.cpuProfilerModel = target.model(SDK.CPUProfilerModel);
         InspectorTest.heapProfilerModel = target.heapProfilerModel;
         InspectorTest.animationModel = target.animationModel;
         InspectorTest.serviceWorkerCacheModel = target.serviceWorkerCacheModel;
         InspectorTest.serviceWorkerManager = target.model(SDK.ServiceWorkerManager);
         InspectorTest.tracingManager = target.model(SDK.TracingManager);
@@ skipping 249 matching lines @@
     _output("[page] " + text);
 }
 
 function _output(result)
 {
     if (!outputElement)
         createOutputElement();
     outputElement.appendChild(document.createTextNode(result));
     outputElement.appendChild(document.createElement("br"));
 }