Remove ContextClient from DOMWindowCrypto

It's not needed.

BUG=610176

Review-Url: https://codereview.chromium.org/2611163003
Cr-Commit-Position: refs/heads/master@{#441900}

third_party/WebKit/Source/modules/crypto/DOMWindowCrypto.cpp

@@ -36,7 +36,7 @@
 namespace blink {
 
 DOMWindowCrypto::DOMWindowCrypto(LocalDOMWindow& window)
-    : ContextClient(window.frame()) {}
+    : Supplement<LocalDOMWindow>(window) {}
 
 const char* DOMWindowCrypto::supplementName() {
   return "DOMWindowCrypto";
@@ -57,7 +57,7 @@ Crypto* DOMWindowCrypto::crypto(DOMWindow& window) {
 }
 
 Crypto* DOMWindowCrypto::crypto() const {
-  if (!m_crypto && frame())
+  if (!m_crypto)
     m_crypto = Crypto::create();
   return m_crypto.get();
 }
@@ -65,7 +65,6 @@ Crypto* DOMWindowCrypto::crypto() const {
 DEFINE_TRACE(DOMWindowCrypto) {
   visitor->trace(m_crypto);
   Supplement<LocalDOMWindow>::trace(visitor);
-  ContextClient::trace(visitor);
 }
 
 }  // namespace blink

third_party/WebKit/Source/modules/crypto/DOMWindowCrypto.h

@@ -31,7 +31,6 @@
 #ifndef DOMWindowCrypto_h
 #define DOMWindowCrypto_h
 
-#include "core/dom/ContextLifecycleObserver.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
@@ -43,8 +42,7 @@ class DOMWindow;
 class LocalDOMWindow;
 
 class DOMWindowCrypto final : public GarbageCollected<DOMWindowCrypto>,
-                              public Supplement<LocalDOMWindow>,
-                              public ContextClient {
+                              public Supplement<LocalDOMWindow> {
   USING_GARBAGE_COLLECTED_MIXIN(DOMWindowCrypto);
 
  public: