Replace unique_ptr.reset with std::move in /net

net/http/http_cache.h

Index: net/http/http_cache.h
diff --git a/net/http/http_cache.h b/net/http/http_cache.h
index 00b3954fb083db79c6b9becd6e2825258f99b6db..8893884ce58fbcb4df8cd94c30fe2a8e7c808ea0 100644
--- a/net/http/http_cache.h
+++ b/net/http/http_cache.h
@@ -181,7 +181,7 @@ class NET_EXPORT HttpCache : public HttpTransactionFactory,
 
   // Get/Set the cache's clock. These are public only for testing.
   void SetClockForTesting(std::unique_ptr<base::Clock> clock) {
-    clock_.reset(clock.release());
+    clock_ = std::move(clock);
   }
   base::Clock* clock() const { return clock_.get(); }