Make CryptoResultImpl not to use WeakPtr.

Source/bindings/core/v8/ScriptPromiseResolver.cpp

 // Copyright 2014 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 "config.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 
 #include "bindings/core/v8/V8RecursionScope.h"
 
 namespace blink {
@@ skipping 62 matching lines @@
             m_resolver.reject(m_value.newLocal(m_scriptState->isolate()));
         }
     }
     clear();
 }
 
 void ScriptPromiseResolver::clear()
 {
     if (m_state == ResolvedOrRejected)
         return;
+
     ResolutionState state = m_state;
     m_state = ResolvedOrRejected;
+    resolverCleared();
     m_resolver.clear();
     m_value.clear();
     if (m_mode == KeepAliveWhilePending) {
         // |ref| was called in |keepAliveWhilePending|.
         deref();
     }
     // |this| may be deleted here, but it is safe to check |state| because
     // it doesn't depend on |this|. When |this| is deleted, |state| can't be
     // |Resolving| nor |Rejecting| and hence |this->deref()| can't be executed.
     if (state == Resolving || state == Rejecting) {
         // |ref| was called in |resolveOrReject|.
         deref();
     }
 }
 
 } // namespace blink