Change PrefStore::ReadResult to a boolean.

chrome/browser/prefs/pref_service.cc

Index: chrome/browser/prefs/pref_service.cc
diff --git a/chrome/browser/prefs/pref_service.cc b/chrome/browser/prefs/pref_service.cc
index 40ae0d30b0261aae0a69afaa4011fde313392145..d36507ac98aab28fbe232aa251150fd7cea28303 100644
--- a/chrome/browser/prefs/pref_service.cc
+++ b/chrome/browser/prefs/pref_service.cc
@@ -731,7 +731,7 @@ const base::Value* PrefService::GetUserPrefValue(const char* path) const {
   // Look for an existing preference in the user store. If it doesn't
   // exist, return NULL.
   base::Value* value = NULL;
-  if (user_pref_store_->GetMutableValue(path, &value) != PrefStore::READ_OK)
+  if (!user_pref_store_->GetMutableValue(path, &value))
     return NULL;
 
   if (!value->IsType(pref->GetType())) {
@@ -746,7 +746,7 @@ const base::Value* PrefService::GetDefaultPrefValue(const char* path) const {
   DCHECK(CalledOnValidThread());
   // Lookup the preference in the default store.
   const base::Value* value = NULL;
-  if (default_store_->GetValue(path, &value) != PrefStore::READ_OK) {
+  if (!default_store_->GetValue(path, &value)) {
     NOTREACHED() << "Default value missing for pref: " << path;
     return NULL;
   }
@@ -932,7 +932,7 @@ Value* PrefService::GetMutableUserPref(const char* path,
   // Look for an existing preference in the user store. If it doesn't
   // exist or isn't the correct type, create a new user preference.
   Value* value = NULL;
-  if (user_pref_store_->GetMutableValue(path, &value) != PrefStore::READ_OK ||
+  if (!user_pref_store_->GetMutableValue(path, &value) ||
       !value->IsType(type)) {
     if (type == Value::TYPE_DICTIONARY) {
       value = new DictionaryValue;