[DevTools] Make WebDevToolsAgentImpl own InspectorOverlayImpl.

Source/web/WebDevToolsAgentImpl.h

Index: Source/web/WebDevToolsAgentImpl.h
diff --git a/Source/web/WebDevToolsAgentImpl.h b/Source/web/WebDevToolsAgentImpl.h
index 6663cbfedadd19078bec624bbeb19c072290834a..a0c5466a31e814fbe564c7ab2ca4ced1778ee44f 100644
--- a/Source/web/WebDevToolsAgentImpl.h
+++ b/Source/web/WebDevToolsAgentImpl.h
@@ -82,6 +82,7 @@ public:
 
     void willBeDestroyed();
     WebDevToolsAgentClient* client() { return m_client; }
+    InspectorOverlay* overlay() const { return m_overlay.get(); }
     bool handleInputEvent(const WebInputEvent&);
     void flushPendingProtocolNotifications();
     void dispatchMessageFromFrontend(const String& message);
@@ -106,7 +107,7 @@ public:
     void evaluateInWebInspector(long callId, const WebString& script) override;
 
 private:
-    WebDevToolsAgentImpl(WebLocalFrameImpl*, WebDevToolsAgentClient*, InspectorOverlay*);
+    WebDevToolsAgentImpl(WebLocalFrameImpl*, WebDevToolsAgentClient*, PassOwnPtrWillBeRawPtr<InspectorOverlay>);
 
     // InspectorStateClient implementation.
     void updateInspectorStateCookie(const WTF::String&) override;
@@ -143,7 +144,7 @@ private:
     OwnPtrWillBeMember<InjectedScriptManager> m_injectedScriptManager;
     OwnPtrWillBeMember<InspectorResourceContentLoader> m_resourceContentLoader;
     OwnPtrWillBeMember<InspectorCompositeState> m_state;
-    RawPtrWillBeMember<InspectorOverlay> m_overlay;
+    OwnPtrWillBeMember<InspectorOverlay> m_overlay;
 
     RawPtrWillBeMember<InspectorInspectorAgent> m_inspectorAgent;
     RawPtrWillBeMember<InspectorDOMAgent> m_domAgent;