Bug 1015664. Part 1: Remove NS_HIDDEN_() usage. r=bsmedberg
Bug 1015664. Part 2: Remove some NS_HIDDEN usage. r=bsmedberg
Bug 1015664. Part 3: Remove NS_HIDDEN_VISIBILITY from NS_IMETHOD_VISIBILITY. r=bsmedberg
Bug 1015664. Part 4: Remove NS_HIDDEN in a few miscellaneous places. r=bsmedberg