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

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

 function scheduleTestFunction()
 {
     setTimeout(testFunction, 0);
 }
 
 var initialize_DebuggerTest = function() {
 
 InspectorTest.preloadPanel("sources");
 
 InspectorTest.startDebuggerTest = function(callback, quiet)
@@ skipping 329 matching lines @@
 
     function runtimeCallFramePosition()
     {
         return new SDK.DebuggerModel.Location(debuggerModel, this.scriptId, this.lineNumber, this.columnNumber);
     }
 
     results.push("Call stack:");
     printCallFrames(callFrames, SDK.DebuggerModel.CallFrame.prototype.location, SDK.DebuggerModel.CallFrame.prototype.returnValue);
     while (asyncStackTrace) {
         results.push("    [" + (asyncStackTrace.description || "Async Call") + "]");
-        var debuggerModel = SDK.DebuggerModel.fromTarget(SDK.targetManager.mainTarget());
+        var debuggerModel = InspectorTest.debuggerModel;
         var printed = printCallFrames(asyncStackTrace.callFrames, runtimeCallFramePosition);
         if (!printed)
             results.pop();
         asyncStackTrace = asyncStackTrace.parent;
     }
     return results.join("\n");
 };
 
 InspectorTest.dumpSourceFrameContents = function(sourceFrame)
 {
     InspectorTest.addResult("==Source frame contents start==");
     var textEditor = sourceFrame._textEditor;
     for (var i = 0; i < textEditor.linesCount; ++i)
         InspectorTest.addResult(textEditor.line(i));
     InspectorTest.addResult("==Source frame contents end==");
 };
 
 InspectorTest._pausedScript = function(callFrames, reason, auxData, breakpointIds, asyncStackTrace)
 {
     if (!InspectorTest._quiet)
         InspectorTest.addResult("Script execution paused.");
-    var debuggerModel = SDK.DebuggerModel.fromTarget(this.target());
+    var debuggerModel = this.target().model(SDK.DebuggerModel);
     InspectorTest._pausedScriptArguments = [SDK.DebuggerModel.CallFrame.fromPayloadArray(debuggerModel, callFrames), reason, breakpointIds, asyncStackTrace, auxData];
     if (InspectorTest._waitUntilPausedCallback) {
         var callback = InspectorTest._waitUntilPausedCallback;
         delete InspectorTest._waitUntilPausedCallback;
         setTimeout(() => callback.apply(callback, InspectorTest._pausedScriptArguments));
     }
 };
 
 InspectorTest._resumedScript = function()
 {
@@ skipping 196 matching lines @@
         var script = InspectorTest.debuggerModel._scripts[scriptId];
         if (!filter || filter(script))
             scripts.push(script);
     }
     return scripts;
 };
 
 InspectorTest.createScriptMock = function(url, startLine, startColumn, isContentScript, source, target, preRegisterCallback)
 {
     target = target || SDK.targetManager.mainTarget();
-    var debuggerModel = SDK.DebuggerModel.fromTarget(target);
+    var debuggerModel = target.model(SDK.DebuggerModel);
     var scriptId = ++InspectorTest._lastScriptId + "";
     var lineCount = source.computeLineEndings().length;
     var endLine = startLine + lineCount - 1;
     var endColumn = lineCount === 1 ? startColumn + source.length : source.length - source.computeLineEndings()[lineCount - 2];
     var hasSourceURL = !!source.match(/\/\/#\ssourceURL=\s*(\S*?)\s*$/m) || !!source.match(/\/\/@\ssourceURL=\s*(\S*?)\s*$/m);
     var script = new SDK.Script(debuggerModel, scriptId, url, startLine, startColumn, endLine, endColumn, 0, "", isContentScript, false, undefined, hasSourceURL, source.length);
     script.requestContent = function()
     {
         var trimmedSource = SDK.Script._trimSourceURLComment(source);
         return Promise.resolve(trimmedSource);
@@ skipping 129 matching lines @@
     var bookmark = bookmarks[index];
     if (bookmark) {
         bookmark[Sources.JavaScriptSourceFrame.BreakpointDecoration._elementSymbolForTest].click();
     } else {
         InspectorTest.addResult(`Could not click on Javascript breakpoint - lineNumber: ${lineNumber}, index: ${index}`);
         next();
     }
 }
 
 };