[cast_channel] Make cast_channel related files not depend on "cast_channel.h"

extensions/browser/api/cast_channel/cast_socket.h

Index: extensions/browser/api/cast_channel/cast_socket.h
diff --git a/extensions/browser/api/cast_channel/cast_socket.h b/extensions/browser/api/cast_channel/cast_socket.h
index cfff93f301621f94a7afb7b4ac455d72e5048abf..3f6d58314240c82e12d02a56a2c5a53f7cfcd872 100644
--- a/extensions/browser/api/cast_channel/cast_socket.h
+++ b/extensions/browser/api/cast_channel/cast_socket.h
@@ -16,12 +16,12 @@
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
+#include "components/cast_channel/cast_channel_enum.h"
 #include "extensions/browser/api/api_resource.h"
 #include "extensions/browser/api/api_resource_manager.h"
 #include "extensions/browser/api/cast_channel/cast_auth_util.h"
 #include "extensions/browser/api/cast_channel/cast_socket.h"
 #include "extensions/browser/api/cast_channel/cast_transport.h"
-#include "extensions/common/api/cast_channel.h"
 #include "extensions/common/api/cast_channel/logging.pb.h"
 #include "net/base/completion_callback.h"
 #include "net/base/io_buffer.h"
@@ -60,6 +60,10 @@ enum CastDeviceCapability {
 // Public interface of the CastSocket class.
 class CastSocket : public ApiResource {
  public:
+  using ChannelError = ::cast_channel::ChannelError;
+  using ChannelAuthType = ::cast_channel::ChannelAuthType;
+  using ReadyState = ::cast_channel::ReadyState;
+
   explicit CastSocket(const std::string& owner_extension_id);
   ~CastSocket() override {}