Generate all extension schema namespaces as "api" and instead vary the generated bundle names.

extensions/browser/api/bluetooth/bluetooth_api.h

Index: extensions/browser/api/bluetooth/bluetooth_api.h
diff --git a/extensions/browser/api/bluetooth/bluetooth_api.h b/extensions/browser/api/bluetooth/bluetooth_api.h
index 506b58cf6503bfb1076e90fe88fd9ccb30403c71..d4f4f1fbb5081b0b2e740a17ae793df40349c7eb 100644
--- a/extensions/browser/api/bluetooth/bluetooth_api.h
+++ b/extensions/browser/api/bluetooth/bluetooth_api.h
@@ -64,7 +64,7 @@ class BluetoothAPI : public BrowserContextKeyedAPI,
   scoped_ptr<BluetoothEventRouter> event_router_;
 };
 
-namespace core_api {
+namespace api {
 
 class BluetoothGetAdapterStateFunction : public BluetoothExtensionFunction {
  public:
@@ -131,7 +131,7 @@ class BluetoothStopDiscoveryFunction : public BluetoothExtensionFunction {
   void OnErrorCallback();
 };
 
-}  // namespace core_api
+}  // namespace api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_BLUETOOTH_BLUETOOTH_API_H_