DevTools: get rid of WebInspector.cssModel, use target models instead

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

 var initialize_DebuggerTest = function() {
 
 InspectorTest.startDebuggerTest = function(callback, quiet)
 {
     console.assert(WebInspector.debuggerModel.debuggerEnabled(), "Debugger has to be enabled");
     if (quiet !== undefined)
         InspectorTest._quiet = quiet;
     WebInspector.inspectorView.showPanel("sources");
 
     InspectorTest.addSniffer(WebInspector.debuggerModel, "_pausedScript", InspectorTest._pausedScript, true);
@@ skipping 182 matching lines @@
                 results.push("       <return>: " + frame.returnValue().description);
         }
         return printed;
     }
 
     results.push("Call stack:");
     printCallFrames(callFrames);
 
     while (asyncStackTrace) {
         results.push("    [" + (asyncStackTrace.description || "Async Call") + "]");
-        var printed = printCallFrames(WebInspector.DebuggerModel.CallFrame.fromPayloadArray(WebInspector.targetManager.activeTarget(), asyncStackTrace.callFrames));
+        var printed = printCallFrames(WebInspector.DebuggerModel.CallFrame.fromPayloadArray(WebInspector.targetManager.mainTarget(), asyncStackTrace.callFrames));
         if (!printed)
             results.pop();
         if (asyncStackTrace.callFrames.peekLast().functionName === "testFunction")
             break;
         asyncStackTrace = asyncStackTrace.asyncStackTrace;
     }
     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.");
-    InspectorTest._pausedScriptArguments = [WebInspector.DebuggerModel.CallFrame.fromPayloadArray(WebInspector.targetManager.activeTarget(), callFrames), reason, breakpointIds, asyncStackTrace, auxData];
+    InspectorTest._pausedScriptArguments = [WebInspector.DebuggerModel.CallFrame.fromPayloadArray(WebInspector.targetManager.mainTarget(), callFrames), reason, breakpointIds, asyncStackTrace, auxData];
     if (InspectorTest._waitUntilPausedCallback) {
         var callback = InspectorTest._waitUntilPausedCallback;
         delete InspectorTest._waitUntilPausedCallback;
         callback.apply(callback, InspectorTest._pausedScriptArguments);
     }
 };
 
 InspectorTest._resumedScript = function()
 {
     if (!InspectorTest._quiet)
@@ skipping 134 matching lines @@
     return scripts;
 };
 
 InspectorTest.createScriptMock = function(url, startLine, startColumn, isContentScript, source)
 {
     var scriptId = ++InspectorTest._lastScriptId;
     var lineCount = source.lineEndings().length;
     var endLine = startLine + lineCount - 1;
     var endColumn = lineCount === 1 ? startColumn + source.length : source.length - source.lineEndings()[lineCount - 2];
     var hasSourceURL = !!source.match(/\/\/#\ssourceURL=\s*(\S*?)\s*$/m) || !!source.match(/\/\/@\ssourceURL=\s*(\S*?)\s*$/m);
-    var script = new WebInspector.Script(WebInspector.targetManager.activeTarget(), scriptId, url, startLine, startColumn, endLine, endColumn, isContentScript, null, hasSourceURL);
+    var script = new WebInspector.Script(WebInspector.targetManager.mainTarget(), scriptId, url, startLine, startColumn, endLine, endColumn, isContentScript, null, hasSourceURL);
     script.requestContent = function(callback)
     {
         var trimmedSource = WebInspector.Script._trimSourceURLComment(source);
         callback(trimmedSource, false, "text/javascript");
     };
     WebInspector.debuggerModel._registerScript(script);
     return script;
 };
 
 InspectorTest._lastScriptId = 0;
@@ skipping 16 matching lines @@
 InspectorTest.scriptFormatter = function()
 {
     var editorActions = WebInspector.moduleManager.instances(WebInspector.SourcesView.EditorAction);
     for (var i = 0; i < editorActions.length; ++i) {
         if (editorActions[i] instanceof WebInspector.ScriptFormatterEditorAction)
             return editorActions[i];
     }
 };
 
 };