[DevTools] Fix debug toolbar drawer style.

Source/devtools/front_end/sourcesPanel.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 53 matching lines @@
 }
 
 .scripts-debug-toolbar-drawer.expanded {
     margin-top: 0;
 }
 
 .scripts-debug-toolbar-drawer > label {
     display: flex;
     padding-left: 3px;
     border-top: 1px solid rgb(196,196,196);
+    height: 24px;

[eustas, 2014/07/02 09:33:20]

I'd rather use white-space: nowrap;

[dgozman, 2014/07/02 09:36:37]

That's a right fix too. But this label is intended to be of the fixed height
(see 46px height in a parent).

 }
 
 #scripts-editor-toolbar {
     position: relative;
     margin-top: -1px;
     height: 24px;
 }
 
 .scripts-run-snippet .glyph {
     -webkit-mask-position: -64px -48px;
@@ skipping 131 matching lines @@
 .panel.sources .drag-mask-inner {
     font-size: 30px;
     color: #999;
     display: flex;
     justify-content: center;
     align-items: center;
     margin: 20px;
     border: 4px dashed #ddd;
     pointer-events: none;
 }