Cleanup shell.cc
Cleanup shell.cc

- We now delayload shell32 so manual function bind is just cruft
- We now include the win7 sdk

BUG=none
TEST=chrome runs on xp
Review URL: http://codereview.chromium.org/9088021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@116396 0039d316-1c4b-4281-b951-d872f2087c98

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