Remove ContextClient from DOMWindowQuota

It's not needed.

BUG=610176

Review-Url: https://codereview.chromium.org/2615163002
Cr-Commit-Position: refs/heads/master@{#441897}

third_party/WebKit/Source/modules/quota/DOMWindowQuota.cpp

@@ -38,7 +38,7 @@
 namespace blink {
 
 DOMWindowQuota::DOMWindowQuota(LocalDOMWindow& window)
-    : ContextClient(window.frame()) {}
+    : Supplement<LocalDOMWindow>(window) {}
 
 const char* DOMWindowQuota::supplementName() {
   return "DOMWindowQuota";
@@ -61,7 +61,7 @@ DeprecatedStorageInfo* DOMWindowQuota::webkitStorageInfo(DOMWindow& window) {
 }
 
 DeprecatedStorageInfo* DOMWindowQuota::webkitStorageInfo() const {
-  if (!m_storageInfo && frame())
+  if (!m_storageInfo)
     m_storageInfo = DeprecatedStorageInfo::create();
   return m_storageInfo.get();
 }
@@ -69,7 +69,6 @@ DeprecatedStorageInfo* DOMWindowQuota::webkitStorageInfo() const {
 DEFINE_TRACE(DOMWindowQuota) {
   visitor->trace(m_storageInfo);
   Supplement<LocalDOMWindow>::trace(visitor);
-  ContextClient::trace(visitor);
 }
 
 }  // namespace blink

third_party/WebKit/Source/modules/quota/DOMWindowQuota.h

@@ -31,7 +31,6 @@
 #ifndef DOMWindowQuota_h
 #define DOMWindowQuota_h
 
-#include "core/dom/ContextLifecycleObserver.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
@@ -42,8 +41,7 @@ class DOMWindow;
 class LocalDOMWindow;
 
 class DOMWindowQuota final : public GarbageCollected<DOMWindowQuota>,
-                             public Supplement<LocalDOMWindow>,
-                             public ContextClient {
+                             public Supplement<LocalDOMWindow> {
   USING_GARBAGE_COLLECTED_MIXIN(DOMWindowQuota);
 
  public: