Convert //media/blink from scoped_ptr to std::unique_ptr

media/blink/key_system_config_selector_unittest.cc

Index: media/blink/key_system_config_selector_unittest.cc
diff --git a/media/blink/key_system_config_selector_unittest.cc b/media/blink/key_system_config_selector_unittest.cc
index 3f96d0f9789b5ca7c55bf7838ef3c7cfa67a7cb3..3ddf94e71ea886486585effcfec09fce0e0c15de 100644
--- a/media/blink/key_system_config_selector_unittest.cc
+++ b/media/blink/key_system_config_selector_unittest.cc
@@ -218,8 +218,8 @@ class KeySystemConfigSelectorTest : public testing::Test {
 
   void OnNotSupported(const blink::WebString&) { not_supported_count_++; }
 
-  scoped_ptr<FakeKeySystems> key_systems_;
-  scoped_ptr<FakeMediaPermission> media_permission_;
+  std::unique_ptr<FakeKeySystems> key_systems_;
+  std::unique_ptr<FakeMediaPermission> media_permission_;
 
   // Held values for the call to SelectConfig().
   blink::WebString key_system_ = blink::WebString::fromUTF8(kSupported);