DevTools: make toolbar button click targets square

Source/devtools/front_end/sources/SourcesPanel.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 724 matching lines @@
         // Step into.
         title = WebInspector.UIString("Step into next function call (%s).");
         this._stepIntoButton = this._createButtonAndRegisterShortcutsForAction("step-in-toolbar-item", title, "debugger.step-into");
         debugToolbar.appendToolbarItem(this._stepIntoButton);
 
         // Step out.
         title = WebInspector.UIString("Step out of current function (%s).");
         this._stepOutButton = this._createButtonAndRegisterShortcutsForAction("step-out-toolbar-item", title, "debugger.step-out");
         debugToolbar.appendToolbarItem(this._stepOutButton);
 
+        debugToolbar.appendSeparator();
+
         // Toggle Breakpoints
         this._toggleBreakpointsButton = new WebInspector.ToolbarButton(WebInspector.UIString("Deactivate breakpoints."), "breakpoint-toolbar-item");
         this._toggleBreakpointsButton.setToggled(false);
         this._toggleBreakpointsButton.addEventListener("click", this._toggleBreakpointsClicked, this);
         debugToolbar.appendToolbarItem(this._toggleBreakpointsButton);
 
         // Pause on Exception
         this._pauseOnExceptionButton = new WebInspector.ToolbarButton("", "pause-on-exceptions-toolbar-item");
         this._pauseOnExceptionButton.addEventListener("click", this._togglePauseOnExceptions, this);
         debugToolbar.appendToolbarItem(this._pauseOnExceptionButton);
 
+        debugToolbar.appendSeparator();
+
         // Async operations
         debugToolbar.appendToolbarItem(new WebInspector.ToolbarCheckbox(WebInspector.UIString("Async"), WebInspector.UIString("Capture async stack traces"), WebInspector.moduleSetting("enableAsyncStackTraces")));
 
         return debugToolbar;
     },
 
     _createDebugToolbarDrawer: function()
     {
         var debugToolbarDrawer = createElementWithClass("div", "scripts-debug-toolbar-drawer");
 
@@ skipping 686 matching lines @@
 WebInspector.SourcesPanelFactory.prototype = {
     /**
      * @override
      * @return {!WebInspector.Panel}
      */
     createPanel: function()
     {
         return WebInspector.SourcesPanel.instance();
     }
 }