olly ca4b5d0a0d Make context non-optional for DefaultBandwidthMeter
- Added ability to override the DefaultBandwidthMeter network type.
- These methods currently only work properly if called before the
  meter is used, but the plan is for them to be handled in the same
  way as internally detected network changes.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=217887019
2018-10-24 18:15:53 +01:00
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