DevTools: fix xhr breakpoint text overflow

Source/devtools/front_end/breakpointsList.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 15 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 .sidebar-pane > .body .breakpoint-condition {
     display: block;
     margin-top: 4px;
     margin-bottom: 4px;
     margin-left: 23px;
     margin-right: 8px;
+    overflow: hidden;
 }
 
 #breakpoint-condition-input {
     display: block;
     margin-left: 0;
     margin-right: 0;
     outline: none !important;
     border: 1px solid rgb(66%, 66%, 66%);
 }
 
@@ skipping 55 matching lines @@
     height: 16px;
 }
 
 .event-listener-breakpoints .checkbox-elem {
     float: left;
     top: -2px;
     position: relative;
     left: -1px;
     font-size: 10px;
 }