Use popall instead of in/del pair

[asvetlov]

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[codecov-io]

Codecov Report

Merging #2002 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2002      +/-   ##
==========================================
- Coverage   97.05%   97.05%   -0.01%     
==========================================
  Files          38       38              
  Lines        7700     7698       -2     
  Branches     1348     1347       -1     
==========================================
- Hits         7473     7471       -2     
  Misses        103      103              
  Partials      124      124

Impacted Files	Coverage Δ
aiohttp/web_response.py	98.71% <100%> (-0.01%)	⬇️
aiohttp/connector.py	97.57% <100%> (-0.01%)	⬇️
aiohttp/formdata.py	98.82% <100%> (ø)	⬆️

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