DevTools: do not respect Chrome theme in DevTools, align toolbar items.

Source/devtools/front_end/ui/tabbedPane.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 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:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 37 matching lines @@
 .tabbed-pane-placeholder {
     font-size: 14px;
     text-align: center;
     margin-top: 20px;
     text-shadow: rgba(255, 255, 255, 0.75) 0 1px 0;
 }
 
 .tabbed-pane-header {
     display: flex;
     flex: 0 0 23px;
-    border-bottom: 1px solid rgb(163, 163, 163);
-    overflow: hidden;
+    border-bottom: 1px solid #dadada;
     width: 100%;
     background-color: #eee;
 }
 
 :host-context(.material) .tabbed-pane-header {
     flex: 0 0 27px;
 }
 
 .tabbed-pane-header-contents {
     flex: auto;
@@ skipping 56 matching lines @@
 
 .tabbed-pane-header-tab:hover .tabbed-pane-close-button,
 .tabbed-pane-header-tab.selected .tabbed-pane-close-button {
     visibility: visible;
 }
 
 .tabbed-pane-header-tabs-drop-down-container {
     float: left;
     position: relative;
     vertical-align: bottom;
-    padding-left: 3px;
     line-height: 20px;
-    opacity: 0.7;
+    opacity: 0.8;
     color: inherit;
     font-size: 133%;
-    padding: 0 3px 0 5px;
+    padding: 0 7px;
     cursor: default;
+    height: 23px;
 }
 
 :host-context(.material) .tabbed-pane-header-tabs-drop-down-container {
     line-height: 25px;
     height: 28px;
     width: 28px;
     text-align: center;
     padding: 0;
 }
 
-:host-context(.material) .tabbed-pane-header-tabs-drop-down-container:hover {
+.tabbed-pane-header-tabs-drop-down-container:hover {
     background-color: rgba(105, 105, 105, 0.1);
 }
 
 .tabbed-pane-header-tabs-drop-down-container.measuring {
     visibility: hidden;
 }
 
 .tabbed-pane-header-tabs-drop-down-container:hover {
     opacity: 1.0;
 }
@@ skipping 55 matching lines @@
     color: inherit;
     border: none transparent;
     border-left: 6px solid #666;
 }
 
 .tabbed-pane-tab-slider {
     width: 1px;
     height: 2px;
     position: absolute;
     bottom: -1px;
-    background-color: #4285F4;
+    background-color: #3E82F7;
     left: 0;
     z-index: 50;
     transform-origin: 0 0;
     transition: transform 150ms cubic-bezier(0, 0, 0.2, 1);
     visibility: hidden;
 }
 
 .tabbed-pane-tab-slider.enabled {
     visibility: visible;
 }
 
 .tabbed-pane-header.tabbed-pane-no-header-background {
     background-color: transparent;
 }