Remove 'WebPlugin::CheckIfRunInsecureContent'.

third_party/WebKit/Source/web/WebLocalFrameImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 95 matching lines @@
     void bindToWindowObject(const WebString& name, NPObject*, void*) override;
     void executeScript(const WebScriptSource&) override;
     void executeScriptInIsolatedWorld(
         int worldID, const WebScriptSource* sources, unsigned numSources,
         int extensionGroup) override;
     void setIsolatedWorldSecurityOrigin(int worldID, const WebSecurityOrigin&) override;
     void setIsolatedWorldContentSecurityPolicy(int worldID, const WebString&) override;
     void setIsolatedWorldHumanReadableName(int worldID, const WebString&) override;
     void addMessageToConsole(const WebConsoleMessage&) override;
     void collectGarbage() override;
-    bool checkIfRunInsecureContent(const WebURL&) const override;
     v8::Local<v8::Value> executeScriptAndReturnValue(
         const WebScriptSource&) override;
     void requestExecuteScriptAndReturnValue(
         const WebScriptSource&, bool userGesture, WebScriptExecutionCallback*) override;
     void executeScriptInIsolatedWorld(
         int worldID, const WebScriptSource* sourcesIn, unsigned numSources,
         int extensionGroup, WebVector<v8::Local<v8::Value>>* results) override;
     void requestExecuteScriptInIsolatedWorld(
         int worldID, const WebScriptSource* sourceIn, unsigned numSources,
         int extensionGroup, bool userGesture, WebScriptExecutionCallback*) override;
@@ skipping 283 matching lines @@
     // cleared upon close().
     SelfKeepAlive<WebLocalFrameImpl> m_selfKeepAlive;
 #endif
 };
 
 DEFINE_TYPE_CASTS(WebLocalFrameImpl, WebFrame, frame, frame->isWebLocalFrame(), frame.isWebLocalFrame());
 
 } // namespace blink
 
 #endif