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/update_client/updater_state.cc b/components/update_client/updater_state.cc
index acf81df..c3581e4 100644
--- a/components/update_client/updater_state.cc
+++ b/components/update_client/updater_state.cc
@@ -24,7 +24,7 @@
 
 UpdaterState::UpdaterState(bool is_machine) : is_machine_(is_machine) {}
 
-UpdaterState::~UpdaterState() {}
+UpdaterState::~UpdaterState() = default;
 
 std::unique_ptr<UpdaterState::Attributes> UpdaterState::GetState(
     bool is_machine) {