Cleaning up deprecated pubsub code.

[sduskis]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2fc4e55). Click here to learn what that means.
The diff coverage is 50%.

@@            Coverage Diff            @@
##             master    #4949   +/-   ##
=========================================
  Coverage          ?   50.36%           
  Complexity        ?    23674           
=========================================
  Files             ?     2233           
  Lines             ?   225860           
  Branches          ?    24952           
=========================================
  Hits              ?   113744           
  Misses            ?   103519           
  Partials          ?     8597

Impacted Files	Coverage Δ	Complexity Δ
...cloud/pubsub/v1/StreamingSubscriberConnection.java	64.75% <0%> (ø)	9 <0> (?)
.../com/google/cloud/pubsub/v1/MessageDispatcher.java	85.56% <100%> (ø)	22 <2> (?)
...ain/java/com/google/cloud/pubsub/v1/Publisher.java	81.05% <100%> (ø)	26 <0> (?)

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