Removed unnecessary ThreadRestrictions::ScopedAllowIO
Removed unnecessary ThreadRestrictions::ScopedAllowIO

The call to base::LoadNativeLibrary in ui/base/win/shell.cc was removed
in r116396, so this exception to allow IO on the UI thread is no longer needed.

BUG=61638
TEST=Running chrome on Win 7


Review URL: http://codereview.chromium.org/9178008

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@117919 0039d316-1c4b-4281-b951-d872f2087c98

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