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

Source/devtools/front_end/timeline/TimelineModelImpl.js

Index: Source/devtools/front_end/timeline/TimelineModelImpl.js
diff --git a/Source/devtools/front_end/timeline/TimelineModelImpl.js b/Source/devtools/front_end/timeline/TimelineModelImpl.js
index d44ae4a323b915d1dfd2decc791b936adcf42599..68b69a282c5b89e822f0d6c8ab7a0231f2318250 100644
--- a/Source/devtools/front_end/timeline/TimelineModelImpl.js
+++ b/Source/devtools/front_end/timeline/TimelineModelImpl.js
@@ -565,7 +565,7 @@ WebInspector.TimelineModelLoader.prototype = {
         try {
             items = /** @type {!Array.<!TimelineAgent.TimelineEvent>} */ (JSON.parse(json));
         } catch (e) {
-            WebInspector.console.addErrorMessage("Malformed timeline data.", true);
+            WebInspector.console.error("Malformed timeline data.");
             this._model.reset();
             this._reader.cancel();
             this._progress.done();
@@ -641,15 +641,15 @@ WebInspector.TimelineModelLoadFromFileDelegate.prototype = {
         this._model.reset();
         switch (event.target.error.code) {
         case FileError.NOT_FOUND_ERR:
-            WebInspector.console.addErrorMessage(WebInspector.UIString("File \"%s\" not found.", reader.fileName()), true);
+            WebInspector.console.error(WebInspector.UIString("File \"%s\" not found.", reader.fileName()));
             break;
         case FileError.NOT_READABLE_ERR:
-            WebInspector.console.addErrorMessage(WebInspector.UIString("File \"%s\" is not readable", reader.fileName()), true);
+            WebInspector.console.error(WebInspector.UIString("File \"%s\" is not readable", reader.fileName()));
             break;
         case FileError.ABORT_ERR:
             break;
         default:
-            WebInspector.console.addErrorMessage(WebInspector.UIString("An error occurred while reading the file \"%s\"", reader.fileName()), true);
+            WebInspector.console.error(WebInspector.UIString("An error occurred while reading the file \"%s\"", reader.fileName()));
         }
     }
 }