Remove superfluous assert.

Review URL: http://codereview.chromium.org/8332028

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9775 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/spaces.h

@@ -459,7 +459,6 @@ class MemoryChunk {
     live_byte_count_ = 0;
   }
   void IncrementLiveBytes(int by) {
-    ASSERT_LE(static_cast<unsigned>(live_byte_count_), size_);
     if (FLAG_gc_verbose) {
       printf("UpdateLiveBytes:%p:%x%c=%x->%x\n",
              static_cast<void*>(this), live_byte_count_,