Move ownership of IdleSpellCheckCallback from LocalFrame to SpellChecker

third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h

Index: third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h
diff --git a/third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h b/third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h
index b3b1a9354226008b29e9fcbfa0f3e17e8621df40..7ddc2c4e392948fb656d778e54921844368ef91e 100644
--- a/third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h
+++ b/third_party/WebKit/Source/core/editing/spellcheck/IdleSpellCheckCallback.h
@@ -37,14 +37,6 @@ class CORE_EXPORT IdleSpellCheckCallback final : public IdleRequestCallback {
   // Exposed for testing only.
   SpellCheckRequester& spellCheckRequester() const;
 
-  // The leak detector will report leaks should queued requests be posted
-  // while it GCs repeatedly, as the requests keep their associated element
-  // alive.
-  //
-  // Hence allow the leak detector to effectively stop the spell checker to
-  // ensure leak reporting stability.
-  void prepareForLeakDetection();
-
   DECLARE_VIRTUAL_TRACE();
 
  private: