Convert LogSourceResource to OnceClosure

This class keeps a callback that's called only when it's destructed so
it can only ever be called once. Hence, it should be a OnceClosure.

Bug: 1152268
Change-Id: I39188310b5b2f61547b983ca1d20ab9c1581b505
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601068Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839755}

extensions/browser/api/feedback_private/log_source_access_manager.cc

@@ -223,7 +223,7 @@ LogSourceAccessManager::ResourceId LogSourceAccessManager::CreateResource(
   // passed in as part of a callback.
   resource_manager->Get(extension_id, resource_id)
       ->set_unregister_callback(
-          base::Bind(&LogSourceAccessManager::RemoveHandle,
+          base::BindOnce(&LogSourceAccessManager::RemoveHandle,
                          weak_factory_.GetWeakPtr(), resource_id));
 
   open_handles_.emplace(

extensions/browser/api/feedback_private/log_source_resource.cc

@@ -27,7 +27,7 @@ LogSourceResource::LogSourceResource(
 
 LogSourceResource::~LogSourceResource() {
   if (!unregister_callback_.is_null())
-    unregister_callback_.Run();
+    std::move(unregister_callback_).Run();
 }
 
 }  // namespace extensions

extensions/browser/api/feedback_private/log_source_resource.h

@@ -31,8 +31,8 @@ class LogSourceResource : public ApiResource {
 
   system_logs::SystemLogsSource* GetLogSource() const { return source_.get(); }
 
-  void set_unregister_callback(const base::Closure& unregister_callback) {
-    unregister_callback_ = unregister_callback;
+  void set_unregister_callback(base::OnceClosure unregister_callback) {
+    unregister_callback_ = std::move(unregister_callback);
   }
 
  private:
@@ -43,7 +43,7 @@ class LogSourceResource : public ApiResource {
 
   // This unregisters the LogSourceResource from a LogSourceAccessManager when
   // this resource is cleaned up.
-  base::Closure unregister_callback_;
+  base::OnceClosure unregister_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(LogSourceResource);
 };