Remove platform/drm files.

Source/web/AssertMatchingEnums.cpp

Index: Source/web/AssertMatchingEnums.cpp
diff --git a/Source/web/AssertMatchingEnums.cpp b/Source/web/AssertMatchingEnums.cpp
index ea411130357f24d5d7b093ae834c9a70293555cc..974750f751e10966f85dc4129e11b62fd826236f 100644
--- a/Source/web/AssertMatchingEnums.cpp
+++ b/Source/web/AssertMatchingEnums.cpp
@@ -66,7 +66,6 @@
 #include "platform/FileMetadata.h"
 #include "platform/FileSystemType.h"
 #include "platform/PlatformMouseEvent.h"
-#include "platform/drm/ContentDecryptionModuleSession.h"
 #include "platform/fonts/FontDescription.h"
 #include "platform/fonts/FontSmoothingMode.h"
 #include "platform/graphics/filters/FilterOperation.h"
@@ -444,9 +443,6 @@ COMPILE_ASSERT_MATCHING_ENUM(WebMouseEvent::ButtonLeft, LeftButton);
 COMPILE_ASSERT_MATCHING_ENUM(WebMouseEvent::ButtonMiddle, MiddleButton);
 COMPILE_ASSERT_MATCHING_ENUM(WebMouseEvent::ButtonRight, RightButton);
 
-COMPILE_ASSERT_MATCHING_ENUM(WebContentDecryptionModuleSession::Client::MediaKeyErrorCodeUnknown, ContentDecryptionModuleSessionClient::UnknownError);
-COMPILE_ASSERT_MATCHING_ENUM(WebContentDecryptionModuleSession::Client::MediaKeyErrorCodeClient, ContentDecryptionModuleSessionClient::ClientError);
-
 COMPILE_ASSERT_MATCHING_ENUM(WebNotificationPresenter::PermissionAllowed, NotificationClient::PermissionAllowed);
 COMPILE_ASSERT_MATCHING_ENUM(WebNotificationPresenter::PermissionNotAllowed, NotificationClient::PermissionNotAllowed);
 COMPILE_ASSERT_MATCHING_ENUM(WebNotificationPresenter::PermissionDenied, NotificationClient::PermissionDenied);