ChromeOS: implement per-user time zone preferences.

chrome/browser/chromeos/extensions/info_private_api.cc

Index: chrome/browser/chromeos/extensions/info_private_api.cc
diff --git a/chrome/browser/chromeos/extensions/info_private_api.cc b/chrome/browser/chromeos/extensions/info_private_api.cc
index 29bd74e2387dafa036aa085ba42a4ce3aa4386e8..af59ee6bd002ef096239b16ae3c229e304482790 100644
--- a/chrome/browser/chromeos/extensions/info_private_api.cc
+++ b/chrome/browser/chromeos/extensions/info_private_api.cc
@@ -326,10 +326,10 @@ std::unique_ptr<base::Value> ChromeosInfoPrivateGetFunction::GetValue(
   }
 
   if (property_name == kPropertyTimezone) {
-    // TODO(crbug.com/697817): Convert CrosSettings::Get to take a unique_ptr.
     return base::WrapUnique<base::Value>(
-        chromeos::CrosSettings::Get()
-            ->GetPref(chromeos::kSystemTimezone)
+        Profile::FromBrowserContext(context_)
+            ->GetPrefs()
+            ->GetUserPrefValue(prefs::kUserTimezone)
             ->DeepCopy());
   }
 
@@ -363,8 +363,8 @@ ExtensionFunction::ResponseAction ChromeosInfoPrivateSetFunction::Run() {
   if (param_name == kPropertyTimezone) {
     std::string param_value;
     EXTENSION_FUNCTION_VALIDATE(args_->GetString(1, &param_value));
-    chromeos::CrosSettings::Get()->Set(chromeos::kSystemTimezone,
-                                       base::Value(param_value));
+    Profile::FromBrowserContext(context_)->GetPrefs()->SetString(
+        prefs::kUserTimezone, param_value);
   } else {
     const char* pref_name = GetBoolPrefNameForApiProperty(param_name.c_str());
     if (pref_name) {