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URLResponseBodyConsumer reads data from a mojo data pipe and dispatches it as a
URLResponseBodyConsumer::ReceivedData. When the dispatched data is destructed,
mojo::EndReadDataRaw is called. Until then, mojo::BeginRead will return
MOJO_RESULT_BUSY. This CL implements the correct handling for such a case.

This mis-handling was the cause of the failure of
virtual/mojo-loading/http/tests/inspector/network/network-fetch.html. This CL
also adds text() call in makeFetch function so that the backpressure mechanism
won't stop the loading.

BUG=669357

Review-Url: https://codereview.chromium.org/2573743002
Cr-Commit-Position: refs/heads/master@{#438756}