DevTools: remove style reuse from flamechart clients, prepare it to become a component.

Source/devtools/front_end/heapProfiler.css

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Apple 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 122 matching lines @@
 }
 
 .cycled-ancessor-node {
     opacity: 0.6;
 }
 
 #heap-recording-view .heap-snapshot-view {
     top: 80px;
 }
 
-.overview-container {
+.heap-overview-container {
     overflow: hidden;
     position: absolute;
     top: 0;
     width: 100%;
     height: 80px;
 }
 
 #heap-recording-overview-grid .resources-dividers-label-bar {
     pointer-events: auto;
 }
@@ skipping 48 matching lines @@
     padding: 2px;
 }
 
 .heap-allocation-stack .stack-frame a {
     color: rgb(33%, 33%, 33%);
 }
 
 .no-heap-allocation-stack {
     padding: 5px;
 }