Fix linker warning in broadcast_channel.mojom-blink.obj.

third_party/WebKit/Source/platform/weborigin/KnownPorts.h

 /*
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  * 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
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  *    documentation and/or other materials provided with the distribution.
  *
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 #ifndef KnownPorts_h
 #define KnownPorts_h
 
-#include "platform/PlatformExport.h"
+#include "platform/weborigin/OriginExport.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class KURL;
 
 // Returns true if |port| is known to be the default for |protocol|. |protocol| must be lower case.
-PLATFORM_EXPORT bool isDefaultPortForProtocol(unsigned short port, const WTF::String& protocol);
+ORIGIN_EXPORT bool isDefaultPortForProtocol(unsigned short port, const WTF::String& protocol);
 
 // Returns 0 for unknown protocols. |protocol| must be lower case.
-PLATFORM_EXPORT unsigned short defaultPortForProtocol(const WTF::String& protocol);
+ORIGIN_EXPORT unsigned short defaultPortForProtocol(const WTF::String& protocol);
 
 // Returns true if the port of the |url| is allowed for the scheme of the |url|.
-PLATFORM_EXPORT bool isPortAllowedForScheme(const KURL&);
+ORIGIN_EXPORT bool isPortAllowedForScheme(const KURL&);
 
 } // namespace blink
 
 #endif // KnownPorts_h