components: Cleanup class/struct fwd declarations

components/cryptauth/cryptauth_client.h

Index: components/cryptauth/cryptauth_client.h
diff --git a/components/cryptauth/cryptauth_client.h b/components/cryptauth/cryptauth_client.h
index 101a0a968097ec30cf97f8227ed5900b21b61c48..ea61625b7b40e7e9f68d6e95e7cfc11b5a67b018 100644
--- a/components/cryptauth/cryptauth_client.h
+++ b/components/cryptauth/cryptauth_client.h
@@ -12,7 +12,6 @@
 #include "base/macros.h"
 
 namespace cryptauth {
-class DeviceClassifier;
 class GetMyDevicesRequest;
 class GetMyDevicesResponse;
 class FindEligibleUnlockDevicesRequest;
@@ -27,15 +26,8 @@ class FinishEnrollmentRequest;
 class FinishEnrollmentResponse;
 }
 
-namespace net {
-class URLRequestContextGetter;
-}
-
 namespace cryptauth {
 
-class CryptAuthAccessTokenFetcher;
-class CryptAuthApiCallFlow;
-
 // Interface for making API requests to the CryptAuth service, which
 // manages cryptographic credentials (ie. public keys) for a user's devices.
 // Implmentations shall only processes a single request, so create a new