arc: Simplify property expansion for browser tests

Since we're going to move the logic to arc-setup soon, browser
tests won't really do the expansion. Instead, we should simply
mark it "done".

BUG=chromium:1163122
TEST=try

Change-Id: Ie27ca7ac73e593bdd8ca42bb367a0807ababbf15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612496Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840951}

chrome/browser/chromeos/arc/test/test_arc_session_manager.cc

@@ -48,16 +48,7 @@ std::unique_ptr<ArcSessionManager> CreateTestArcSessionManager(
 
 bool ExpandPropertyFilesForTesting(ArcSessionManager* arc_session_manager,
                                    const base::FilePath& temp_dir) {
-  // For browser_tests, do the actual prop file expansion to make it more
-  // similar to production. Calling ExpandPropertyFiles() here is fine as long
-  // as the caller doesn't explicitly call ArcServiceLauncher::Initialize()
-  // after recreating ASM with ArcServiceLauncher::ResetForTesting().
-  base::FilePath source_dir, dest_dir;
-  if (!CreateFilesAndDirectories(temp_dir, &source_dir, &dest_dir))
-    return false;
-  arc_session_manager->set_property_files_source_dir_for_testing(source_dir);
-  arc_session_manager->set_property_files_dest_dir_for_testing(dest_dir);
-  arc_session_manager->ExpandPropertyFilesAndReadSalt();
+  arc_session_manager->OnExpandPropertyFilesAndReadSaltForTesting(true);
   return true;
 }
 

chrome/browser/chromeos/arc/test/test_arc_session_manager.h

@@ -24,9 +24,8 @@ std::unique_ptr<ArcSessionManager> CreateTestArcSessionManager(
 
 // Does something similar to CreateTestArcSessionManager(), but for an existing
 // object. This function is useful for ARC browser_tests where ArcSessionManager
-// object is (re)created with ArcServiceLauncher::ResetForTesting(). This
-// function automatically starts prop files expansion and it succeeds as long as
-// |temp_dir| is writable.
+// object is (re)created with ArcServiceLauncher::ResetForTesting().
+// TODO(yusukes): Remove |temp_dir| argument which is unused.
 bool ExpandPropertyFilesForTesting(ArcSessionManager* arc_session_manager,
                                    const base::FilePath& temp_dir);