Change PrefStore::ReadResult to a boolean.

chrome/service/service_process_prefs.cc

Index: chrome/service/service_process_prefs.cc
diff --git a/chrome/service/service_process_prefs.cc b/chrome/service/service_process_prefs.cc
index e417988be8eaa6a02bbffc5afe91a8bb2db3bd09..71b74fe8bd8d99967294d0a16022a34b85207753 100644
--- a/chrome/service/service_process_prefs.cc
+++ b/chrome/service/service_process_prefs.cc
@@ -28,10 +28,9 @@ std::string ServiceProcessPrefs::GetString(
     const std::string& default_value) const {
   const Value* value;
   std::string result;
-  if (prefs_->GetValue(key, &value) != PersistentPrefStore::READ_OK ||
-      !value->GetAsString(&result)) {
+  if (!prefs_->GetValue(key, &value) || !value->GetAsString(&result))
     return default_value;
-  }
+
   return result;
 }
 
@@ -44,10 +43,9 @@ bool ServiceProcessPrefs::GetBoolean(const std::string& key,
                                      bool default_value) const {
   const Value* value;
   bool result = false;
-  if (prefs_->GetValue(key, &value) != PersistentPrefStore::READ_OK ||
-      !value->GetAsBoolean(&result)) {
+  if (!prefs_->GetValue(key, &value) || !value->GetAsBoolean(&result))
     return default_value;
-  }
+
   return result;
 }
 
@@ -59,10 +57,9 @@ int ServiceProcessPrefs::GetInt(const std::string& key,
                                 int default_value) const {
   const Value* value;
   int result = default_value;
-  if (prefs_->GetValue(key, &value) != PersistentPrefStore::READ_OK ||
-      !value->GetAsInteger(&result)) {
+  if (!prefs_->GetValue(key, &value) || !value->GetAsInteger(&result))
     return default_value;
-  }
+
   return result;
 }
 
@@ -73,7 +70,7 @@ void ServiceProcessPrefs::SetInt(const std::string& key, int value) {
 const DictionaryValue* ServiceProcessPrefs::GetDictionary(
     const std::string& key) const {
   const Value* value;
-  if (prefs_->GetValue(key, &value) != PersistentPrefStore::READ_OK ||
+  if (!prefs_->GetValue(key, &value) ||
       !value->IsType(Value::TYPE_DICTIONARY)) {
     return NULL;
   }
@@ -84,10 +81,8 @@ const DictionaryValue* ServiceProcessPrefs::GetDictionary(
 const base::ListValue* ServiceProcessPrefs::GetList(
     const std::string& key) const {
   const Value* value;
-  if (prefs_->GetValue(key, &value) != PersistentPrefStore::READ_OK ||
-    !value->IsType(Value::TYPE_LIST)) {
-      return NULL;
-  }
+  if (!prefs_->GetValue(key, &value) || !value->IsType(Value::TYPE_LIST))
+    return NULL;
 
   return static_cast<const ListValue*>(value);
 }