Revert 10502 (smaller number string cache) due to test failures.

src/heap.h

Index: src/heap.h
===================================================================
--- src/heap.h	(revision 10502)
+++ src/heap.h	(working copy)
@@ -1798,13 +1798,8 @@
   GCTracer* tracer_;
 
 
-  // Allocates a small number to string cache.
-  MUST_USE_RESULT MaybeObject* AllocateInitialNumberStringCache();
-  // Creates and installs the full-sized number string cache.
-  void AllocateFullSizeNumberStringCache();
-  // Get the length of the number to string cache based on the max semispace
-  // size.
-  int FullSizeNumberStringCacheLength();
+  // Initializes the number to string cache based on the max semispace size.
+  MUST_USE_RESULT MaybeObject* InitializeNumberStringCache();
   // Flush the number to string cache.
   void FlushNumberStringCache();
 
@@ -1901,7 +1896,6 @@
 
   static const int kInitialSymbolTableSize = 2048;
   static const int kInitialEvalCacheSize = 64;
-  static const int kInitialNumberStringCacheSize = 256;
 
   // Maximum GC pause.
   int max_gc_pause_;