Refactor preference syncing.

chrome/browser/about_flags_unittest.cc

Index: chrome/browser/about_flags_unittest.cc
diff --git a/chrome/browser/about_flags_unittest.cc b/chrome/browser/about_flags_unittest.cc
index 32b002dbab49c687fcc0e9f9c5c54e14a95ff61a..6ec77e449f0fd9fa94867a3cf6482eca2a82b297 100644
--- a/chrome/browser/about_flags_unittest.cc
+++ b/chrome/browser/about_flags_unittest.cc
@@ -86,11 +86,18 @@ static Experiment kExperiments[] = {
 class AboutFlagsTest : public ::testing::Test {
  protected:
   AboutFlagsTest() {
-    prefs_.RegisterListPref(prefs::kEnabledLabsExperiments);
+    prefs_.RegisterListPref(prefs::kEnabledLabsExperiments,
+                            false /* don't sync pref */);
 #if defined(OS_CHROMEOS)
-    prefs_.RegisterBooleanPref(prefs::kLabsMediaplayerEnabled, false);
-    prefs_.RegisterBooleanPref(prefs::kLabsAdvancedFilesystemEnabled, false);
-    prefs_.RegisterBooleanPref(prefs::kUseVerticalTabs, false);
+    prefs_.RegisterBooleanPref(prefs::kLabsMediaplayerEnabled,
+                               false,
+                               false /* don't sync pref */);
+    prefs_.RegisterBooleanPref(prefs::kLabsAdvancedFilesystemEnabled,
+                               false,
+                               false /* don't sync pref */);
+    prefs_.RegisterBooleanPref(prefs::kUseVerticalTabs,
+                               false,
+                               false /* don't sync pref */);
 #endif
     testing::ClearState();
   }