Fix typo.

src/platform/virtual-memory.h

 // Copyright 2013 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 21 matching lines @@
 #include "globals.h"
 
 namespace v8 {
 namespace internal {
 
 // -----------------------------------------------------------------------------
 // VirtualMemory
 //
 // This class represents and controls an area of reserved memory.
 // Control of the reserved memory can be assigned to another VirtualMemory
-// object by assignment or contructing. This removes the reserved memory from
-// the original object.
+// object by assignment or copy-constructing. This removes the reserved memory
+// from the original object.
 class VirtualMemory V8_FINAL {
  public:
   // The executability of a memory region.
   enum Executability { NOT_EXECUTABLE, EXECUTABLE };
 
   // Empty VirtualMemory object, controlling no reserved memory.
   VirtualMemory() : address_(NULL), size_(0) {}
 
   // Reserves virtual memory with size.
   explicit VirtualMemory(size_t size) : size_(0) {
@@ skipping 148 matching lines @@
   }
 
  private:
   void* address_;  // Start address of the virtual memory.
   size_t size_;  // Size of the virtual memory.
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_VIRTUAL_MEMORY_H_