Revert of Revert of DevTools: Introduce module initializers

Source/devtools/front_end/layers/LayersPanel.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-importScript("LayerTreeOutline.js");
-importScript("LayerDetailsView.js");
-importScript("LayerPaintProfilerView.js");
-
 /**
  * @constructor
  * @extends {WebInspector.PanelWithSidebarTree}
  */
 WebInspector.LayersPanel = function()
 {
     WebInspector.PanelWithSidebarTree.call(this, "layers", 225);
     this.registerRequiredCSS("layersPanel.css");
 
     this.sidebarElement().classList.add("outline-disclosure");
@@ skipping 169 matching lines @@
      */
     reveal: function(snapshotData)
     {
         if (!(snapshotData instanceof WebInspector.DeferredLayerTree))
             return;
         var panel = /** @type {?WebInspector.LayersPanel} */ (WebInspector.inspectorView.showPanel("layers"));
         if (panel)
             panel._showLayerTree(/** @type {!WebInspector.DeferredLayerTree} */ (snapshotData));
     }
 }