Pepper: Remove PPP_ManifestService.

Now that enough logic has been moved out of the trusted plugin, we can get rid
of PPP_ManifestService and make the code in the Non-SFI case much clearer.

CQ_EXTRA_TRYBOTS=tryserver.chromium:linux_rel_precise32
BUG=239656

Review URL: https://codereview.chromium.org/356053004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280204 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed