Use `default` instead of empty body ctor and dtor definitions.

This is a mechanical change over files in the update_client,
component_updater, and the extension updater.

Change-Id: I2a5b682299cbb04bdfa9f5691329dfa97e869d2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2104396
Reviewed-by: Joshua Pawlicki <[email protected]>
Commit-Queue: Sorin Jianu <[email protected]>
Cr-Commit-Position: refs/heads/master@{#750544}
diff --git a/components/component_updater/configurator_impl.cc b/components/component_updater/configurator_impl.cc
index d809633..5066fb2 100644
--- a/components/component_updater/configurator_impl.cc
+++ b/components/component_updater/configurator_impl.cc
@@ -52,7 +52,7 @@
   }
 }
 
-ConfiguratorImpl::~ConfiguratorImpl() {}
+ConfiguratorImpl::~ConfiguratorImpl() = default;
 
 int ConfiguratorImpl::InitialDelay() const {
   if (initial_delay_)