Make the Android GN debug component build actually build.

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 750e7fa0eb0894a207b27e368c118c0ffd2faf8e..fc6d99ae2b13ab827034accf45b1323ca4a3b63e 100644
--- a/media/blink/key_system_config_selector_unittest.cc
+++ b/media/blink/key_system_config_selector_unittest.cc
@@ -218,7 +218,7 @@ class KeySystemConfigSelectorTest : public testing::Test {
   scoped_ptr<FakeMediaPermission> media_permission_;
 
   // Held values for the call to SelectConfig().
-  blink::WebString key_system_ = kSupported;
+  blink::WebString key_system_ = blink::WebString::fromUTF8(kSupported);
   std::vector<blink::WebMediaKeySystemConfiguration> configs_;
   blink::WebSecurityOrigin security_origin_ =
       blink::WebSecurityOrigin::createFromString(kDefaultSecurityOrigin);