Make calls to AtomicString(const String&) explicit in rendering/

Source/core/rendering/FastTextAutosizer.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 158 matching lines @@
         if (inlineObj->isRenderBlock() && m_clusterForBlock.contains(toRenderBlock(inlineObj)))
             continue;
 
         applyMultiplier(inlineObj, cluster->m_multiplier);
     }
 }
 
 AtomicString FastTextAutosizer::fingerprint(const RenderBlock* block)
 {
     // FIXME(crbug.com/322340): Implement a better fingerprinting algorithm.
-    return String::number((unsigned long long) block);
+    return AtomicString::number((unsigned long long) block);
 }
 
 void FastTextAutosizer::recalcClusterIfNeeded(FastTextAutosizer::Cluster* cluster)
 {
     ASSERT(m_windowWidth > 0);
     if (!cluster->needsClusterRecalc())
         return;
 
     WTF::HashSet<RenderBlock*>& blocks = cluster->m_blocks;
 
@@ skipping 32 matching lines @@
 
     // Cluster root layout width, in CSS pixels.
     float rootWidth = toRenderBlock(cluster->m_clusterRoot)->contentLogicalWidth();
 
     // FIXME: incorporate font scale factor.
     float multiplier = min(rootWidth, layoutWidth) / m_windowWidth;
     cluster->m_multiplier = max(multiplier, 1.0f);
 }
 
 } // namespace WebCore