Remove PluginLoadObserver and related logic, it was only used for NPAPI.

third_party/WebKit/Source/web/WebPluginLoadObserver.h

Index: third_party/WebKit/Source/web/WebPluginLoadObserver.h
diff --git a/third_party/WebKit/Source/web/WebPluginLoadObserver.h b/third_party/WebKit/Source/web/WebPluginLoadObserver.h
deleted file mode 100644
index 25ecd7a1cd21cf29c4a0e7d07367a8fa6010cfa7..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/web/WebPluginLoadObserver.h
+++ /dev/null
@@ -1,75 +0,0 @@
-/*
- * 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
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef WebPluginLoadObserver_h
-#define WebPluginLoadObserver_h
-
-#include "platform/heap/Handle.h"
-#include "public/platform/WebURL.h"
-
-namespace blink {
-
-class WebPluginContainerImpl;
-struct WebURLError;
-
-class WebPluginLoadObserver final : public NoBaseWillBeGarbageCollectedFinalized<WebPluginLoadObserver> {
-public:
-    static PassOwnPtrWillBeRawPtr<WebPluginLoadObserver> create(WebPluginContainerImpl* pluginContainer, const WebURL& notifyURL, void* notifyData)
-    {
-        return adoptPtrWillBeNoop(new WebPluginLoadObserver(pluginContainer, notifyURL, notifyData));
-    }
-    ~WebPluginLoadObserver();
-
-    const WebURL& url() const { return m_notifyURL; }
-
-#if !ENABLE(OILPAN)
-    void clearPluginContainer() { m_pluginContainer = nullptr; }
-#endif
-    void didFinishLoading();
-    void didFailLoading(const WebURLError&);
-
-    DECLARE_TRACE();
-
-private:
-    WebPluginLoadObserver(WebPluginContainerImpl* pluginContainer, const WebURL& notifyURL, void* notifyData)
-        : m_pluginContainer(pluginContainer)
-        , m_notifyURL(notifyURL)
-        , m_notifyData(notifyData)
-    {
-    }
-
-    RawPtrWillBeWeakMember<WebPluginContainerImpl> m_pluginContainer;
-    WebURL m_notifyURL;
-    void* m_notifyData;
-};
-
-} // namespace blink
-
-#endif