Drop deprecated app.make_handler()

[asvetlov]

No description provided.

[codecov-io]

Codecov Report

Merging #3939 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3939      +/-   ##
==========================================
- Coverage   97.72%   97.67%   -0.05%     
==========================================
  Files          43       43              
  Lines        8780     8773       -7     
  Branches     1380     1380              
==========================================
- Hits         8580     8569      -11     
- Misses         86       89       +3     
- Partials      114      115       +1

Impacted Files	Coverage Δ
aiohttp/web_app.py	97.28% <ø> (-1.9%)	⬇️
aiohttp/web_runner.py	97.78% <100%> (+0.15%)	⬆️

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