media/gpu/v4l2vd: use make_unique() to build unique_ptrs

Reported by clang-tidy.

Bug: None
Test: video_decode_accelerator_tests --use_vd passes on Hana.
Change-Id: I43bf640830297ef3daeaf3c938585ce36167939b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364340
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799685}

media/gpu/v4l2/v4l2_video_decoder_backend_stateless.cc

@@ -8,6 +8,8 @@
 #include <linux/media.h>
 #include <sys/ioctl.h>
 
+#include <memory>
+
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/posix/eintr_wrapper.h"
@@ -636,25 +638,24 @@ bool V4L2StatelessVideoDecoderBackend::CreateAvd() {
 
   if (profile_ >= H264PROFILE_MIN && profile_ <= H264PROFILE_MAX) {
     if (input_queue_->SupportsRequests()) {
-      avd_.reset(new H264Decoder(
-          std::make_unique<V4L2H264Accelerator>(this, device_.get()),
-          profile_));
+      avd_ = std::make_unique<H264Decoder>(
+          std::make_unique<V4L2H264Accelerator>(this, device_.get()), profile_);
     } else {
-      avd_.reset(new H264Decoder(
+      avd_ = std::make_unique<H264Decoder>(
           std::make_unique<V4L2LegacyH264Accelerator>(this, device_.get()),
-          profile_));
+          profile_);
     }
   } else if (profile_ >= VP8PROFILE_MIN && profile_ <= VP8PROFILE_MAX) {
     if (input_queue_->SupportsRequests()) {
-      avd_.reset(new VP8Decoder(
-          std::make_unique<V4L2VP8Accelerator>(this, device_.get())));
+      avd_ = std::make_unique<VP8Decoder>(
+          std::make_unique<V4L2VP8Accelerator>(this, device_.get()));
     } else {
-      avd_.reset(new VP8Decoder(
-          std::make_unique<V4L2LegacyVP8Accelerator>(this, device_.get())));
+      avd_ = std::make_unique<VP8Decoder>(
+          std::make_unique<V4L2LegacyVP8Accelerator>(this, device_.get()));
     }
   } else if (profile_ >= VP9PROFILE_MIN && profile_ <= VP9PROFILE_MAX) {
-    avd_.reset(new VP9Decoder(
-        std::make_unique<V4L2VP9Accelerator>(this, device_.get()), profile_));
+    avd_ = std::make_unique<VP9Decoder>(
+        std::make_unique<V4L2VP9Accelerator>(this, device_.get()), profile_);
   } else {
     VLOGF(1) << "Unsupported profile " << GetProfileName(profile_);
     return false;