DevTools: network log bars use CSS instead of pre-rendered images.

Source/devtools/devtools.gypi

 #
 # 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 227 matching lines @@
             'front_end/timelinePanel.css',
             'front_end/canvasProfiler.css',
             'front_end/layersPanel.css',
         ],
         'devtools_elements_js_files': [
             'front_end/CSSNamedFlowCollectionsView.js',
             'front_end/CSSNamedFlowView.js',
             'front_end/ElementsPanel.js',
             'front_end/EventListenersSidebarPane.js',
             'front_end/MetricsSidebarPane.js',
-            'front_end/OverridesView.js', 
+            'front_end/OverridesView.js',
             'front_end/PlatformFontsSidebarPane.js',
             'front_end/PropertiesSidebarPane.js',
             'front_end/RenderingOptionsView.js',
             'front_end/StylesSidebarPane.js',
         ],
         'devtools_resources_js_files': [
             'front_end/ApplicationCacheItemsView.js',
             'front_end/DOMStorageItemsView.js',
             'front_end/DatabaseQueryView.js',
             'front_end/DatabaseTableView.js',
@@ skipping 183 matching lines @@
             'front_end/Images/statusbarButtonGlyphs.png',
             'front_end/Images/statusbarButtonGlyphs2x.png',
             'front_end/Images/statusbarResizerHorizontal.png',
             'front_end/Images/statusbarResizerVertical.png',
             'front_end/Images/thumbActiveHoriz.png',
             'front_end/Images/thumbActiveVert.png',
             'front_end/Images/thumbHoriz.png',
             'front_end/Images/thumbVert.png',
             'front_end/Images/thumbHoverHoriz.png',
             'front_end/Images/thumbHoverVert.png',
-            'front_end/Images/timelineHollowPillBlue.png',
-            'front_end/Images/timelineHollowPillGray.png',
-            'front_end/Images/timelineHollowPillGreen.png',
-            'front_end/Images/timelineHollowPillOrange.png',
-            'front_end/Images/timelineHollowPillPurple.png',
-            'front_end/Images/timelineHollowPillRed.png',
-            'front_end/Images/timelineHollowPillYellow.png',
-            'front_end/Images/timelinePillBlue.png',
-            'front_end/Images/timelinePillGray.png',
-            'front_end/Images/timelinePillGreen.png',
-            'front_end/Images/timelinePillOrange.png',
-            'front_end/Images/timelinePillPurple.png',
-            'front_end/Images/timelinePillRed.png',
-            'front_end/Images/timelinePillYellow.png',
             'front_end/Images/toolbarItemSelected.png',
             'front_end/Images/trackHoriz.png',
             'front_end/Images/trackVert.png',
         ],
         'devtools_layers_js_files': [
             'front_end/LayersPanel.js',
             'front_end/LayerTreeModel.js',
             'front_end/LayerTree.js',
             'front_end/Layers3DView.js',
             'front_end/LayerDetailsView.js',
             'front_end/PaintProfilerView.js',
         ],
         'devtools_extension_api_files': [
             'front_end/ExtensionAPI.js',
             'front_end/DevToolsExtensionAPI.js'
         ],
     },
 }