DevTools: consistently use Maybe for optional values in the protocol generator.

third_party/WebKit/Source/web/InspectorEmulationAgent.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InspectorEmulationAgent_h
 #define InspectorEmulationAgent_h
 
 #include "core/inspector/InspectorBaseAgent.h"
 
 namespace blink {
@@ skipping 13 matching lines @@
         virtual void setCPUThrottlingRate(double rate) {}
     };
 
     static PassOwnPtrWillBeRawPtr<InspectorEmulationAgent> create(WebLocalFrameImpl*, Client*);
     ~InspectorEmulationAgent() override;
 
     // protocol::Dispatcher::EmulationCommandHandler implementation.
     void resetPageScaleFactor(ErrorString*) override;
     void setPageScaleFactor(ErrorString*, double in_pageScaleFactor) override;
     void setScriptExecutionDisabled(ErrorString*, bool in_value) override;
-    void setTouchEmulationEnabled(ErrorString*, bool in_enabled, const protocol::OptionalValue<String>& in_configuration) override;
+    void setTouchEmulationEnabled(ErrorString*, bool in_enabled, const protocol::Maybe<String>& in_configuration) override;
     void setEmulatedMedia(ErrorString*, const String& in_media) override;
     void setCPUThrottlingRate(ErrorString*, double in_rate) override;
 
     // InspectorBaseAgent overrides.
     void disable(ErrorString*) override;
     void restore() override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     InspectorEmulationAgent(WebLocalFrameImpl*, Client*);
     WebViewImpl* webViewImpl();
 
     RawPtrWillBeMember<WebLocalFrameImpl> m_webLocalFrameImpl;
     Client* m_client;
 };
 
 } // namespace blink
 
 #endif // !defined(InspectorEmulationAgent_h)