Make MediaPlayerEventRouter a PKS to decouple it from ExtensionService

chrome/browser/profiles/profile_dependency_manager.cc

Index: chrome/browser/profiles/profile_dependency_manager.cc
diff --git a/chrome/browser/profiles/profile_dependency_manager.cc b/chrome/browser/profiles/profile_dependency_manager.cc
index 6df75f222ed148d4a1140608395111215db9fa29..6109b3eb2e684c0b6f4724b36f55640436cc3fdc 100644
--- a/chrome/browser/profiles/profile_dependency_manager.cc
+++ b/chrome/browser/profiles/profile_dependency_manager.cc
@@ -87,6 +87,7 @@
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/extensions/input_method_api_factory.h"
+#include "chrome/browser/chromeos/extensions/media_player_api.h"
 #include "chrome/browser/extensions/api/input_ime/input_ime_api.h"
 #if defined(FILE_MANAGER_EXTENSION)
 #include "chrome/browser/chromeos/extensions/file_browser_private_api_factory.h"
@@ -262,6 +263,9 @@ void ProfileDependencyManager::AssertFactoriesBuilt() {
   extensions::ManagedModeAPI::GetFactoryInstance();
   extensions::ManagementAPI::GetFactoryInstance();
   extensions::MediaGalleriesPrivateAPIFactory::GetInstance();
+#if defined(OS_CHROMEOS)
+  extensions::MediaPlayerAPI::GetFactoryInstance();
+#endif
   extensions::OmniboxAPI::GetFactoryInstance();
   extensions::PreferenceAPI::GetFactoryInstance();
   extensions::ProcessesAPI::GetFactoryInstance();