Don't raise InvalidStateError on two consequenced data_received() calls

[asvetlov]

Fix for #2773

[codecov-io]

Codecov Report

Merging #2775 into 3.0 will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              3.0    #2775      +/-   ##
==========================================
+ Coverage   97.97%   98.02%   +0.05%     
==========================================
  Files          39       39              
  Lines        7341     7595     +254     
  Branches     1286     1369      +83     
==========================================
+ Hits         7192     7445     +253     
- Misses         47       49       +2     
+ Partials      102      101       -1

Impacted Files	Coverage Δ
aiohttp/web_protocol.py	91.8% <100%> (+0.05%)	⬆️
aiohttp/web_urldispatcher.py	99.15% <0%> (-0.05%)	⬇️
aiohttp/http_writer.py	100% <0%> (ø)	⬆️
aiohttp/test_utils.py	98.92% <0%> (+0.44%)	⬆️

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[pfreixes]

Thanks for the fixing!

[asvetlov]

Welcome!
Every major aiohttp release has such bugs.
Your changes was been made for good reason.
Unfortunately our test suite did not catch the problem.
Now everything is fine I hope.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new