Fix more warnings on linux

Source/core/html/canvas/WebGLRenderingContext.cpp

 /*
  * Copyright (C) 2009 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 69 matching lines @@
 
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Uint32Array.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
 const double secondsBetweenRestoreAttempts = 1.0;
 const int maxGLErrorsAllowedToConsole = 256;
-const int maxGLActiveContexts = 16;
+const unsigned maxGLActiveContexts = 16;
 
 Vector<WebGLRenderingContext*>& WebGLRenderingContext::activeContexts()
 {
     DEFINE_STATIC_LOCAL(Vector<WebGLRenderingContext*>, activeContexts, ());
     return activeContexts;
 }
 
 Vector<WebGLRenderingContext*>& WebGLRenderingContext::forciblyEvictedContexts()
 {
     DEFINE_STATIC_LOCAL(Vector<WebGLRenderingContext*>, forciblyEvictedContexts, ());
@@ skipping 5514 matching lines @@
         if (m_textureUnits[i].m_texture2DBinding
             || m_textureUnits[i].m_textureCubeMapBinding) {
             m_onePlusMaxNonDefaultTextureUnit = i + 1;
             return;
         }
     }
     m_onePlusMaxNonDefaultTextureUnit = 0;
 }
 
 } // namespace WebCore