Correct data size argument type in resource loading path to unsigned

Source/platform/SharedBuffer.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 154 matching lines @@
     if (size < 0)
         CRASH();
 
     append(data, size);
 
 #ifdef SHARED_BUFFER_STATS
     didCreateSharedBuffer(this);
 #endif
 }
 
-SharedBuffer::SharedBuffer(const char* data, int size, PurgeableVector::PurgeableOption purgeable)
+SharedBuffer::SharedBuffer(const char* data, unsigned size, PurgeableVector::PurgeableOption purgeable)
     : m_size(0)
     , m_buffer(purgeable)
 {
-    // FIXME: Use unsigned consistently, and check for invalid casts when calling into SharedBuffer from other code.
-    if (size < 0)
-        CRASH();
-
     append(data, size);
 
 #ifdef SHARED_BUFFER_STATS
     didCreateSharedBuffer(this);
 #endif
 }
 
 SharedBuffer::SharedBuffer(const unsigned char* data, int size)
     : m_size(0)
     , m_buffer(PurgeableVector::NotPurgeable)
@@ skipping 220 matching lines @@
     mergeSegmentsIntoBuffer();
     m_buffer.unlock();
 }
 
 bool SharedBuffer::isLocked() const
 {
     return m_buffer.isLocked();
 }
 
 } // namespace blink