[Code health] Convert base::Bind in media_file_system_registry_unittest.cc

This CL converts base::Bind to base::BindOnce in this file. The
function is already expecting a OnceCallback so using BindOnce is
the right choice.

Bug: 1152278
Change-Id: I168b2049878b43cef21065a5bf6825ddfa64e68b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593469Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837148}

chrome/browser/media_galleries/media_file_system_registry_unittest.cc

@@ -513,7 +513,7 @@ void ProfileState::CheckGalleries(
   std::vector<base::string16> empty_names;
   registry->GetMediaFileSystemsForExtension(
       single_web_contents_.get(), no_permissions_extension_.get(),
-      base::Bind(&ProfileState::CompareResults, base::Unretained(this),
+      base::BindOnce(&ProfileState::CompareResults, base::Unretained(this),
                      base::StringPrintf("%s (no permission)", test.c_str()),
                      std::cref(empty_names), std::cref(empty_expectation)));
   content::RunAllTasksUntilIdle();
@@ -522,7 +522,8 @@ void ProfileState::CheckGalleries(
   // Read permission only.
   registry->GetMediaFileSystemsForExtension(
       single_web_contents_.get(), regular_permission_extension_.get(),
-      base::Bind(&ProfileState::CompareResults, base::Unretained(this),
+      base::BindOnce(
+          &ProfileState::CompareResults, base::Unretained(this),
           base::StringPrintf("%s (regular permission)", test.c_str()),
           std::cref(compare_names_read_),
           std::cref(regular_extension_galleries)));
@@ -532,7 +533,7 @@ void ProfileState::CheckGalleries(
   // All galleries permission.
   registry->GetMediaFileSystemsForExtension(
       single_web_contents_.get(), all_permission_extension_.get(),
-      base::Bind(&ProfileState::CompareResults, base::Unretained(this),
+      base::BindOnce(&ProfileState::CompareResults, base::Unretained(this),
                      base::StringPrintf("%s (all permission)", test.c_str()),
                      std::cref(compare_names_all_),
                      std::cref(all_extension_galleries)));
@@ -546,7 +547,7 @@ FSInfoMap ProfileState::GetGalleriesInfo(extensions::Extension* extension) {
       g_browser_process->media_file_system_registry();
   registry->GetMediaFileSystemsForExtension(
       single_web_contents_.get(), extension,
-      base::Bind(&GetGalleryInfoCallback, base::Unretained(&results)));
+      base::BindOnce(&GetGalleryInfoCallback, base::Unretained(&results)));
   content::RunAllTasksUntilIdle();
   return results;
 }