Bring npapi.h closer to the npapi-headers project version
Bring npapi.h closer to the npapi-headers project version

This makes a bunch of changes that shouldn't actually affect anything:
- Removes XP_MAC
- Removes old Carbon event constants
- Removes Metrowerks defines
- Adds new constants and structs from recent spec updates
- Adds OS/2 defines
- Adds Maemo defines

Also makes more whitespace adjustments to track central repository.

BUG=42645
TEST=none; no behavioral changes

Review URL: http://codereview.chromium.org/1995007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@46596 0039d316-1c4b-4281-b951-d872f2087c98

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