small misspelling fixes.

src/serialize.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 504 matching lines @@
         code_has_been_output_(false) { }
     void Serialize();
     void VisitPointers(Object** start, Object** end);
     void VisitEmbeddedPointer(RelocInfo* target);
     void VisitExternalReferences(Address* start, Address* end);
     void VisitExternalReference(RelocInfo* rinfo);
     void VisitCodeTarget(RelocInfo* target);
     void VisitCodeEntry(Address entry_address);
     void VisitGlobalPropertyCell(RelocInfo* rinfo);
     void VisitRuntimeEntry(RelocInfo* reloc);
-    // Used for seralizing the external strings that hold the natives source.
+    // Used for serializing the external strings that hold the natives source.
     void VisitExternalAsciiString(
         v8::String::ExternalAsciiStringResource** resource);
     // We can't serialize a heap with external two byte strings.
     void VisitExternalTwoByteString(
         v8::String::ExternalStringResource** resource) {
       UNREACHABLE();
     }
 
    private:
     enum ReturnSkip { kCanReturnSkipInsteadOfSkipping, kIgnoringReturn };
@@ skipping 118 matching lines @@
  private:
   virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) {
     return false;
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_