Make Heap::AllocateRaw*String private.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index e8fdafb581a5903a884bd511916c45a185ea57b7..409a01d513c9758a5ead7ab8d5617963f24ab95a 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -826,20 +826,6 @@ class Heap {
   MUST_USE_RESULT MaybeObject* AllocateInternalizedStringImpl(
       T t, int chars, uint32_t hash_field);
 
-  // Allocates and partially initializes a String.  There are two String
-  // encodings: ASCII and two byte.  These functions allocate a string of the
-  // given length and set its map and length fields.  The characters of the
-  // string are uninitialized.
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateRawOneByteString(
-      int length,
-      PretenureFlag pretenure = NOT_TENURED);
-  MUST_USE_RESULT MaybeObject* AllocateRawTwoByteString(
-      int length,
-      PretenureFlag pretenure = NOT_TENURED);
-
   // Computes a single character string where the character has code.
   // A cache is used for ASCII codes.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
@@ -1989,7 +1975,7 @@ class Heap {
     return (pretenure == TENURED) ? preferred_old_space : NEW_SPACE;
   }
 
-  // Allocates an uninitialized object.  The memory is non-executable if the
+  // Allocate an uninitialized object.  The memory is non-executable if the
   // hardware and OS allow.  This is the single choke-point for allocations
   // performed by the runtime and should not be bypassed (to extend this to
   // inlined allocations, use the Heap::DisableInlineAllocation() support).
@@ -2009,6 +1995,15 @@ class Heap {
   MUST_USE_RESULT MaybeObject* AllocateFixedArrayWithFiller(
       int length, PretenureFlag pretenure, Object* filler);
 
+  // Allocate and partially initializes a String.  There are two String
+  // encodings: ASCII and two byte.  These functions allocate a string of the
+  // given length and set its map and length fields.  The characters of the
+  // string are uninitialized.
+  MUST_USE_RESULT MaybeObject* AllocateRawOneByteString(
+      int length, PretenureFlag pretenure);
+  MUST_USE_RESULT MaybeObject* AllocateRawTwoByteString(
+      int length, PretenureFlag pretenure);
+
   // Initializes a JSObject based on its map.
   void InitializeJSObjectFromMap(JSObject* obj,
                                  FixedArray* properties,