Remove unuse class.

[carryxyh]

Remove unuse class.

• DelegateExporter.java
• DelegateInvoker.java

[codecov-io]

Codecov Report

Merging #2608 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2608      +/-   ##
============================================
+ Coverage     55.07%   55.08%   +0.01%     
- Complexity     5289     5293       +4     
============================================
  Files           573      571       -2     
  Lines         25538    25521      -17     
  Branches       4531     4530       -1     
============================================
- Hits          14064    14059       -5     
+ Misses         9367     9360       -7     
+ Partials       2107     2102       -5

Impacted Files	Coverage Δ	Complexity Δ
...che/dubbo/remoting/transport/mina/MinaChannel.java	42.25% <0%> (-11.27%)	15% <0%> (-1%)
...onfig/spring/extension/SpringExtensionFactory.java	68.96% <0%> (-6.9%)	11% <0%> (ø)
.../java/org/apache/dubbo/config/ReferenceConfig.java	50.35% <0%> (-0.72%)	42% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	62.35% <0%> (+1.17%)	23% <0%> (+1%)	⬆️
...he/dubbo/registry/multicast/MulticastRegistry.java	57.32% <0%> (+1.72%)	38% <0%> (+3%)	⬆️
...he/dubbo/remoting/transport/netty/NettyServer.java	71.42% <0%> (+3.57%)	9% <0%> (+1%)	⬆️

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