Refact. Build flutter web (#7472)
* Refact. Build flutter web Signed-off-by: fufesou <shuanglongchen@yeah.net> * Refact. Flutter web, wrap Platform.xx Signed-off-by: fufesou <shuanglongchen@yeah.net> --------- Signed-off-by: fufesou <shuanglongchen@yeah.net>
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