Skip a first-run import on Mac when there is nothing left to import.

chrome/browser/first_run/first_run.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/first_run/first_run.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
+#include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/updater/extension_updater.h"
 #include "chrome/browser/first_run/first_run_dialog.h"
 #include "chrome/browser/first_run/first_run_import_observer.h"
@@ skipping 186 matching lines @@
   return importer_observer.import_result();
 }
 
 }  // namespace
 
 namespace first_run {
 namespace internal {
 
 FirstRunState first_run_ = FIRST_RUN_UNKNOWN;
 
-installer::MasterPreferences* LoadMasterPrefs(FilePath* master_prefs_path)
-{
-  *master_prefs_path = FilePath(MasterPrefsPath());
+static base::LazyInstance<FilePath> master_prefs_path_for_testing
+    = LAZY_INSTANCE_INITIALIZER;
+
+installer::MasterPreferences* LoadMasterPrefs(FilePath* master_prefs_path) {
+  if (!master_prefs_path_for_testing.Get().empty())
+    *master_prefs_path = master_prefs_path_for_testing.Get();
+  else
+    *master_prefs_path = FilePath(MasterPrefsPath());
   if (master_prefs_path->empty())
     return NULL;
   installer::MasterPreferences* install_prefs =
       new installer::MasterPreferences(*master_prefs_path);
   if (!install_prefs->read_from_file()) {
     delete install_prefs;
     return NULL;
   }
 
   return install_prefs;
@@ skipping 311 matching lines @@
 
   // Reset the preference and notifications to avoid showing the bubble again.
   prefs->SetInteger(prefs::kShowFirstRunBubbleOption,
                     FIRST_RUN_BUBBLE_DONT_SHOW);
 
   // Show the bubble now and destroy this bubble launcher.
   browser->ShowFirstRunBubble();
   delete this;
 }
 
+void SetMasterPrefsPathForTesting(const FilePath& master_prefs) {
+  internal::master_prefs_path_for_testing.Get() = master_prefs;
+}
+
 ProcessMasterPreferencesResult ProcessMasterPreferences(
     const FilePath& user_data_dir,
     MasterPrefs* out_prefs) {
   DCHECK(!user_data_dir.empty());
 
 #if defined(OS_CHROMEOS)
   // Chrome OS has its own out-of-box-experience code.  Create the sentinel to
   // mark the fact that we've run once but skip the full first-run flow.
   CreateSentinel();
   return SKIP_FIRST_RUN_TASKS;
@@ skipping 142 matching lines @@
   if (template_url && template_url->GetDefaultSearchProvider())
     FirstRunBubbleLauncher::ShowFirstRunBubbleSoon();
   SetShowWelcomePagePref();
   SetPersonalDataManagerFirstRunPref();
 #endif  // !defined(USE_AURA)
 
   internal::DoPostImportPlatformSpecificTasks();
 }
 
 }  // namespace first_run