Use base::GetDeleteFileCallback() in c/b/chromeos.

Now that this function exists, there is no need to reinvent it.

Bug: 1009837
Change-Id: I2980378d90d7c2f7440caec519d532d3656ee569
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261696Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782013}

chrome/browser/chromeos/policy/arc_app_install_event_log_manager.cc

@@ -61,11 +61,8 @@ void ArcAppInstallEventLogManager::Clear(
     Profile* profile) {
   AppInstallEventLogger::Clear(profile);
   log_task_runner_wrapper->GetTaskRunner()->PostTask(
-      FROM_HERE, base::BindOnce(
-                     [](const base::FilePath& log_file_path) {
-                       base::DeleteFile(log_file_path, false /* recursive */);
-                     },
-                     GetLogFilePath(*profile)));
+      FROM_HERE,
+      base::BindOnce(base::GetDeleteFileCallback(), GetLogFilePath(*profile)));
 }
 
 void ArcAppInstallEventLogManager::Add(

chrome/browser/chromeos/policy/extension_install_event_log_manager.cc

@@ -62,11 +62,8 @@ void ExtensionInstallEventLogManager::Clear(
     LogTaskRunnerWrapper* log_task_runner_wrapper,
     Profile* profile) {
   log_task_runner_wrapper->GetTaskRunner()->PostTask(
-      FROM_HERE, base::BindOnce(
-                     [](const base::FilePath& log_file_path) {
-                       base::DeleteFile(log_file_path, false /* recursive */);
-                     },
-                     GetLogFilePath(*profile)));
+      FROM_HERE,
+      base::BindOnce(base::GetDeleteFileCallback(), GetLogFilePath(*profile)));
 }
 
 void ExtensionInstallEventLogManager::Add(