adjust blink::equalIgnoringFragmentIdentifier to work better for data:

Source/platform/weborigin/KURL.cpp

 /*
  * Copyright (C) 2004, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2008, 2009, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 689 matching lines @@
 
 #ifndef NDEBUG
 void KURL::print() const
 {
     printf("%s\n", m_string.utf8().data());
 }
 #endif
 
 bool equalIgnoringFragmentIdentifier(const KURL& a, const KURL& b)
 {
+    if (a.protocolIsData() && b.protocolIsData())
+        return a.m_string == b.m_string;
+
     // Compute the length of each URL without its ref. Note that the reference
     // begin (if it exists) points to the character *after* the '#', so we need
     // to subtract one.
     int aLength = a.m_string.length();
     if (a.m_parsed.ref.len >= 0)
         aLength = a.m_parsed.ref.begin - 1;
 
     int bLength = b.m_string.length();
     if (b.m_parsed.ref.len >= 0)
         bLength = b.m_parsed.ref.begin - 1;
@@ skipping 193 matching lines @@
     m_string = AtomicString::fromUTF8(output.data(), output.length());
 }
 
 bool KURL::isSafeToSendToAnotherThread() const
 {
     return m_string.isSafeToSendToAnotherThread()
         && (!m_innerURL || m_innerURL->isSafeToSendToAnotherThread());
 }
 
 } // namespace blink