Fix new space shrinking to compute correct capacity.

src/spaces.h

 // Copyright 2011 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1775 matching lines @@
   // Sets up the semispace using the given chunk.
   bool Setup(Address start, int initial_capacity, int maximum_capacity);
 
   // Tear down the space.  Heap memory was not allocated by the space, so it
   // is not deallocated here.
   void TearDown();
 
   // True if the space has been set up but not torn down.
   bool HasBeenSetup() { return start_ != NULL; }
 
-  // Grow the size of the semispace by committing extra virtual memory.
-  // Assumes that the caller has checked that the semispace has not reached
-  // its maximum capacity (and thus there is space available in the reserved
-  // address range to grow).
-  bool Grow();
-
   // Grow the semispace to the new capacity.  The new capacity
-  // requested must be larger than the current capacity.
+  // requested must be larger than the current capacity and less than
+  // the maximum capacity.
   bool GrowTo(int new_capacity);
 
   // Shrinks the semispace to the new capacity.  The new capacity
   // requested must be more than the amount of used memory in the
   // semispace and less than the current capacity.
   bool ShrinkTo(int new_capacity);
 
   // Returns the start address of the first page of the space.
   Address space_start() {
     ASSERT(anchor_.next_page() != &anchor_);
@@ skipping 803 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_