Cancel unnecessary spellcheck requests.

chrome/renderer/spellchecker/spellcheck_provider.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 "chrome/renderer/spellchecker/spellcheck_provider.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/spellcheck_messages.h"
 #include "chrome/common/spellcheck_result.h"
@@ skipping 70 matching lines @@
       text_check_completions_.Add(completion),
       document_tag,
       text));
 #else
   // Send this text to a browser. A browser checks the user profile and send
   // this text to the Spelling service only if a user enables this feature.
   // TODO(hbono) Implement a cache to avoid sending IPC messages.
   string16 line;
   int offset = -1;
   if (!GetRequestLine(text, &line, &offset)) {
-    completion->didFinishCheckingText(std::vector<WebTextCheckingResult>());
+    completion->didCancelCheckingText();
     return;
   }
 
   last_line_ = line;
   Send(new SpellCheckHostMsg_CallSpellingService(
       routing_id(),
       text_check_completions_.Add(completion),
       offset,
       line));
 #endif  // !OS_MACOSX
@@ skipping 247 matching lines @@
   // TODO(darin): There's actually no reason for this to be here.  We should
   // have the browser side manage the document tag.
 #if defined(OS_MACOSX)
   if (!has_document_tag_) {
     // Make the call to get the tag.
     Send(new SpellCheckHostMsg_GetDocumentTag(routing_id(), &document_tag_));
     has_document_tag_ = true;
   }
 #endif
 }