Remove most ScopedVector usage from c/b/extensions.

components/sync/device_info/device_count_metrics_provider_unittest.cc

Index: components/sync/device_info/device_count_metrics_provider_unittest.cc
diff --git a/components/sync/device_info/device_count_metrics_provider_unittest.cc b/components/sync/device_info/device_count_metrics_provider_unittest.cc
index 3e0d83df97206cbaafe9f838636796006a96419e..d98b7ad3f98b9dd665ad734b2b9bf91daddbe194 100644
--- a/components/sync/device_info/device_count_metrics_provider_unittest.cc
+++ b/components/sync/device_info/device_count_metrics_provider_unittest.cc
@@ -28,8 +28,8 @@ class FakeTracker : public DeviceInfoTracker {
       const std::string& client_id) const override {
     return std::unique_ptr<DeviceInfo>();
   }
-  ScopedVector<DeviceInfo> GetAllDeviceInfo() const override {
-    return ScopedVector<DeviceInfo>();
+  std::vector<std::unique_ptr<DeviceInfo>> GetAllDeviceInfo() const override {
+    return std::vector<std::unique_ptr<DeviceInfo>>();
   }
   void AddObserver(Observer* observer) override {}
   void RemoveObserver(Observer* observer) override {}