Move some sync/notifier to components/invalidation

Moves many of the files in sync/notifier to components/invalidation.

This change does not introduce any new dependencies.  The relevant
dependency rules both before and after this change should be:
- chrome/browser/invalidation and chrome in general depend on
  components/invalidation.
- components/invalidation depends on sync/notifier and sync in
  general.
- sync/notifier, components/invalidation, and various parts of
  chrome all depend on sync/internal_api/public.

The eventual goal is to move all of sync/notifier into
components/invalidation.  The invalidation-related parts of
sync/internal_api/public should be moved to components/invalidation,
too.  This will allow us to remove the deopendencies from
components/invalidation to sync, and remove sync's dependencies on
cacheinvalidation and libjingle.

This change is a regression in terms of shared library componentization.
the files in the sync/notifier folder could be built as a shared
library.  The files in compononents/invalidation do not support this
yet.  The SYNC_EXPORT declarations in the moved files have been changed
to INVALIDATION_EXPORT so as to not lose this information, but the
macros are currently #defined to no-ops.

This change does not attempt to rename any classes or namespaces.
Many of the files ported from sync/notifier still use the syncer
namespace.  Some, like SyncSystemResources, still have names tied
to their sync heritage.  This will be addressed in future CLs.

Some non-trivial or non-obvious changes include:
- invalidator_state.h was moved to sync/internal_api/public/base so it
could be shared by both sync/ and components/invalidation.  This should
be fixed in a future CL.
- FromNotifierReason was split out of invalidator_state.h and moved to
the newly-created components/invalidator_reason_util.h

TBR=zea,rtenneti,mallinath,dcheng
BUG=259559

Review URL: https://codereview.chromium.org/294123004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274350 0039d316-1c4b-4281-b951-d872f2087c98

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