[heycam/webidl] [SecureContext] restrictions on interface vs. interface member are confusing (#153)

Previously at https://github.com/heycam/webidl/pull/121#discussion_r76252969

The spec currently says

> The [SecureContext] extended attribute MUST NOT be specified on both an interface member and the interface or partial interface definition the interface member is declared on. 

It's not clear what "declared on" means especially in the context of partial interfaces. E.g. consider the situation

```webidl
[SecureContext] interface Foo {};
partial interface Foo {
  [SecureContext] void func();
};
```

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