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IdentityProvider currently has baked-in knowledge of OAuth2TokenService
for functionality that is shared between ProfileIdentityProvider and
DeviceIdentityProvider. However, as we will be converting
ProfileIdentityProvider to talk to IdentityManager rather than
OAuth2TokenService, this baked-in knowledge needs to be moved out of
IdentityProvider; ultimately, it will end up only in
DeviceIdentityProvider.

This CL takes the first step along that path by moving
ActiveAccountAccessTokenFetcherImpl, which fetches access tokens via
OAuth2TokenService, out of identity_provider.cc into its own file. The
next CL will have ProfileIdentityProvider and DeviceIdentityProvider
each implement FetchAccessToken() rather than having IdentityProvider do
so directly.

Bug: 809452
Change-Id: I664c4da998cf90d0a398dc2c9e309425f95515a3
Reviewed-on: https://chromium-review.googlesource.com/1114604Reviewed-by: Pavel Yatsuk <pavely@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571070}