Extension Settings API: move the API functions into an object SettingsNamepace,

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 009dedbc23a8adc337eebb8e7c908e2f6c60a669..54dd0c298198ed543094b5e9d0d5bd4a02ed33ff 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -169,9 +169,15 @@ ExtensionService::NaClModuleInfo::~NaClModuleInfo() {
 // ExtensionService.
 
 const char* ExtensionService::kInstallDirectoryName = "Extensions";
-const char* ExtensionService::kExtensionSettingsDirectoryName =
-    "Extension Settings";
-const char* ExtensionService::kAppSettingsDirectoryName = "App Settings";
+
+const char* ExtensionService::kLocalAppSettingsDirectoryName =
+    "Local App Settings";
+const char* ExtensionService::kLocalExtensionSettingsDirectoryName =
+    "Local Extension Settings";
+const char* ExtensionService::kSyncAppSettingsDirectoryName =
+    "Sync App Settings";
+const char* ExtensionService::kSyncExtensionSettingsDirectoryName =
+    "Sync Extension Settings";
 
 void ExtensionService::CheckExternalUninstall(const std::string& id) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));