Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

content/renderer/text_input_client_observer.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/text_input_client_observer.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 30 matching lines @@
     IPC_MESSAGE_HANDLER(TextInputClientMsg_CharacterIndexForPoint,
                         OnCharacterIndexForPoint)
     IPC_MESSAGE_HANDLER(TextInputClientMsg_FirstRectForCharacterRange,
                         OnFirstRectForCharacterRange)
     IPC_MESSAGE_HANDLER(TextInputClientMsg_StringForRange, OnStringForRange)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
+void TextInputClientObserver::OnDestruct() {
+  delete this;
+}
+
 blink::WebView* TextInputClientObserver::webview() {
   return render_view()->GetWebView();
 }
 
 void TextInputClientObserver::OnStringAtPoint(gfx::Point point) {
 #if defined(OS_MACOSX)
   blink::WebPoint baselinePoint;
   NSAttributedString* string = blink::WebSubstringUtil::attributedWordAtPoint(
       webview(), point, baselinePoint);
 
@@ skipping 45 matching lines @@
   std::unique_ptr<const mac::AttributedStringCoder::EncodedString> encoded(
       mac::AttributedStringCoder::Encode(string));
   Send(new TextInputClientReplyMsg_GotStringForRange(routing_id(),
       *encoded.get(), baselinePoint));
 #else
   NOTIMPLEMENTED();
 #endif
 }
 
 }  // namespace content