Remove WEBKIT_DLL and replace it with COMPONENT_BUILD

public/platform/WebCommon.h

 /*
  * Copyright (C) 2010 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebCommon_h
 #define WebCommon_h
 
 #if !defined(WEBKIT_IMPLEMENTATION)
 #define WEBKIT_IMPLEMENTATION 0
 #endif
 
-#if defined(WEBKIT_DLL)
+#if defined(COMPONENT_BUILD)
 #if defined(WIN32)
 #if WEBKIT_IMPLEMENTATION
 #define WEBKIT_EXPORT __declspec(dllexport)
 #else // WEBKIT_IMPLEMENTATION
 #define WEBKIT_EXPORT __declspec(dllimport)
 #endif
 #else // defined(WIN32)
 #define WEBKIT_EXPORT __attribute__((visibility("default")))
 #endif
-#else // defined(WEBKIT_DLL)
+#else // defined(COMPONENT_BUILD)
 #define WEBKIT_EXPORT
 #endif
 
 #if !defined(BLINK_COMMON_IMPLEMENTATION)
 #define BLINK_COMMON_IMPLEMENTATION 0
 #endif
 
 #if defined(COMPONENT_BUILD)
 #if defined(WIN32)
 #if BLINK_COMMON_IMPLEMENTATION
@@ skipping 47 matching lines @@
 #else
 #define WEBKIT_ASSERT(assertion) do { \
     if (!(assertion)) \
         failedAssertion(__FILE__, __LINE__, __FUNCTION__, #assertion); \
 } while (0)
 #endif
 
 #define WEBKIT_ASSERT_NOT_REACHED() WEBKIT_ASSERT(0)
 
 #endif