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This CL initializes a single-threaded apartment on the main thread in the daemon and configures COM security in the following way:
  - The daemon authenticates that all data received is from the expected client.
  - The daemon can impersonate clients to check their identity but cannot act on their behalf.
  - The caller's identity on every call (Dynamic cloaking).
  - Activations where the activated COM server would run under the daemon's identity are prohibited.

BUG=137696

Review URL: https://codereview.chromium.org/12378078

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186245 0039d316-1c4b-4281-b951-d872f2087c98