Let Flash take one-shot focus in default MediaSession

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index c07efd2914ef38e9d64098fcfb8a7d50bbc58918..c7e02e2c39d8637983da8a9610feabf2618e2985 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -70,13 +70,14 @@ const char kUseCras[] = "use-cras";
 // Use a media session for each tabs in a way that two tabs can't play on top of
 // each other. This is different from the Media Session API as it is enabling a
 // default behaviour for the browser. The allowed values are: "" (empty),
-// |kEnableDefaultMediaSessionWithFlash|.
+// |kEnableDefaultMediaSessionDuckFlash|.
 const char kEnableDefaultMediaSession[] = "enable-default-media-session";
 #endif  // !defined(OS_ANDROID) || defined(ENABLE_PLUGINS)
 
 #if defined(ENABLE_PLUGINS)
-// This value is used as an option for |kEnableDefaultMediaSession|.
-const char kEnableDefaultMediaSessionWithFlash[] = "with-flash";
+// This value is used as an option for |kEnableDefaultMediaSession|. Flash will
+// be ducked when losing audio focus.
+const char kEnableDefaultMediaSessionDuckFlash[] = "duck-flash";
 #endif  // defined(ENABLE_PLUGINS)
 
 // Use fake device for Media Stream to replace actual camera and microphone.