small misspelling fixes.

src/isolate.h

 // Copyright 2012 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 189 matching lines @@
  public:
   // Does early low-level initialization that does not depend on the
   // isolate being present.
   ThreadLocalTop();
 
   // Initialize the thread data.
   void Initialize();
 
   // Get the top C++ try catch handler or NULL if none are registered.
   //
-  // This method is not guarenteed to return an address that can be
+  // This method is not guaranteed to return an address that can be
   // used for comparison with addresses into the JS stack.  If such an
   // address is needed, use try_catch_handler_address.
   v8::TryCatch* TryCatchHandler();
 
   // Get the address of the top C++ try catch handler or NULL if
   // none are registered.
   //
   // This method always returns an address that can be compared to
   // pointers into the JavaScript stack.  When running on actual
   // hardware, try_catch_handler_address and TryCatchHandler return
@@ skipping 1261 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_