Make USB a ContextLifecycleObserver.

third_party/WebKit/Source/modules/webusb/USB.h

Index: third_party/WebKit/Source/modules/webusb/USB.h
diff --git a/third_party/WebKit/Source/modules/webusb/USB.h b/third_party/WebKit/Source/modules/webusb/USB.h
index 841b0e485b1379a0baa33e3778fed4a3b26f2c35..8d406a6ec624d1db12fe6ddfcd069eaa26958e4a 100644
--- a/third_party/WebKit/Source/modules/webusb/USB.h
+++ b/third_party/WebKit/Source/modules/webusb/USB.h
@@ -7,8 +7,8 @@
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
-#include "core/frame/LocalFrameLifecycleObserver.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/webusb/WebUSBClient.h"
 
@@ -21,7 +21,7 @@ class WebUSBDevice;
 
 class USB final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<USB>
-    , public LocalFrameLifecycleObserver
+    , public ContextLifecycleObserver
     , public WebUSBClient::Observer {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(USB);
@@ -44,8 +44,8 @@ public:
     ExecutionContext* getExecutionContext() const override;
     const AtomicString& interfaceName() const override;
 
-    // LocalFrameLifecycleObserver overrides.
-    void willDetachFrameHost() override;
+    // ContextLifecycleObserver overrides.
+    void contextDestroyed() override;
 
     // WebUSBClient::Observer overrides.
     void onDeviceConnected(WebPassOwnPtr<WebUSBDevice>) override;