Privatize StrongBinding lifetime management

content/browser/device_sensors/device_sensor_host.h

Index: content/browser/device_sensors/device_sensor_host.h
diff --git a/content/browser/device_sensors/device_sensor_host.h b/content/browser/device_sensors/device_sensor_host.h
index 2332140196a4185cdc34d45fa712d62bb5e95cb1..e7fceb3f255bea1e9327f9010c816f5d0d9259a0 100644
--- a/content/browser/device_sensors/device_sensor_host.h
+++ b/content/browser/device_sensors/device_sensor_host.h
@@ -12,7 +12,6 @@
 #include "device/sensors/public/interfaces/motion.mojom.h"
 #include "device/sensors/public/interfaces/orientation.mojom.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
-#include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace content {
 
@@ -26,7 +25,7 @@ class DeviceSensorHost : public MojoInterface {
   ~DeviceSensorHost() override;
 
  private:
-  explicit DeviceSensorHost(mojo::InterfaceRequest<MojoInterface> request);
+  DeviceSensorHost();
 
   void StartPolling(
       const typename MojoInterface::StartPollingCallback& callback) override;
@@ -34,8 +33,6 @@ class DeviceSensorHost : public MojoInterface {
 
   bool is_started_;
 
-  mojo::StrongBinding<MojoInterface> binding_;
-
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceSensorHost);