Remove page visibility requirement for WebUSB.

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

Index: third_party/WebKit/Source/modules/webusb/USBDevice.h
diff --git a/third_party/WebKit/Source/modules/webusb/USBDevice.h b/third_party/WebKit/Source/modules/webusb/USBDevice.h
index a5e01eecfc79aa19ed09b9093ba3e04a1c5a0434..9b5154b85c006e597c20bb8a9aadf5c400ccc3e0 100644
--- a/third_party/WebKit/Source/modules/webusb/USBDevice.h
+++ b/third_party/WebKit/Source/modules/webusb/USBDevice.h
@@ -9,7 +9,6 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "core/dom/ContextLifecycleObserver.h"
-#include "core/page/PageLifecycleObserver.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/webusb/WebUSBDevice.h"
 #include "public/platform/modules/webusb/WebUSBDeviceInfo.h"
@@ -26,8 +25,7 @@ class USBControlTransferParameters;
 class USBDevice
     : public GarbageCollectedFinalized<USBDevice>
     , public ContextLifecycleObserver
-    , public ScriptWrappable
-    , public PageLifecycleObserver {
+    , public ScriptWrappable {
     USING_GARBAGE_COLLECTED_MIXIN(USBDevice);
     DEFINE_WRAPPERTYPEINFO();
 public:
@@ -90,16 +88,12 @@ public:
     // ContextLifecycleObserver interface.
     void contextDestroyed() override;
 
-    // PageLifecycleObserver interface.
-    void pageVisibilityChanged() override;
-
     DECLARE_TRACE();
 
 private:
     int findConfigurationIndex(uint8_t configurationValue) const;
     int findInterfaceIndex(uint8_t interfaceNumber) const;
     int findAlternateIndex(size_t interfaceIndex, uint8_t alternateSetting) const;
-    bool ensurePageVisible(ScriptPromiseResolver*) const;
     bool ensureNoDeviceOrInterfaceChangeInProgress(ScriptPromiseResolver*) const;
     bool ensureDeviceConfigured(ScriptPromiseResolver*) const;
     bool ensureInterfaceClaimed(uint8_t interfaceNumber, ScriptPromiseResolver*) const;