DevTools: make toolbar button click targets square

Source/devtools/front_end/profiler/profilesPanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * 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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 48 matching lines @@
     width: 48px;
     display: inline-block;
 }
 
 .profile-view .data-grid tr.selected span {
     color: inherit;
 }
 
 .profiles-toolbar {
     display: flex;
-    background-color: #eee;
+    background-color: #f3f3f3;
     flex: 0 0 25px;
     flex-direction: row;
     border-bottom: 1px solid rgb(202, 202, 202);
 }
 
 .material .profiles-toolbar {
     flex: 0 0 29px;
 }
 
 .profile-launcher-view-tree-item > .icon {
@@ skipping 174 matching lines @@
     bottom: 0;
 }
 
 #cpu-profile-flame-chart-overview-grid .resources-dividers-label-bar {
     pointer-events: auto;
 }
 
 .cpu-profile-flame-chart-overview-pane {
     flex: 0 0 80px !important;
 }