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

Source/devtools/devtools.gypi

Index: Source/devtools/devtools.gypi
diff --git a/Source/devtools/devtools.gypi b/Source/devtools/devtools.gypi
index 10a60fea596701bba2232b252e114b5c99645354..8eaeaba6dc2608c0f0f5acf98297a1bae2d1cb00 100644
--- a/Source/devtools/devtools.gypi
+++ b/Source/devtools/devtools.gypi
@@ -245,7 +245,7 @@
             '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',
@@ -450,20 +450,6 @@
             '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',