Declaration of sha1HashSize variable in proper file

Source/wtf/SHA1.h

 /*
  * Copyright (C) 2011 Google Inc. 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
@@ skipping 39 matching lines @@
         const char* string = input.data();
         // Make sure that the creator of the CString didn't make the mistake
         // of forcing length() to be the size of the buffer used to create the
         // string, prior to inserting the null terminator earlier in the
         // sequence.
         ASSERT(input.length() == strlen(string));
         addBytes(reinterpret_cast<const uint8_t*>(string), input.length());
     }
     void addBytes(const uint8_t* input, size_t length);
 
+    static const size_t outputSizeBytes = 20;
+
     // computeHash has a side effect of resetting the state of the object.
-    void computeHash(Vector<uint8_t, 20>&);
+    void computeHash(Vector<uint8_t, outputSizeBytes>&);
 
 private:
     void finalize();
     void processBlock();
     void reset();
 
     uint8_t m_buffer[64];
     size_t m_cursor; // Number of bytes filled in m_buffer (0-64).
     uint64_t m_totalBytes; // Number of bytes added so far.
     uint32_t m_hash[5];
 };
 
 } // namespace WTF
 
 using WTF::SHA1;
 
 #endif // WTF_SHA1_h