Forward declaration of DrmRootCertificate.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=227608878

sdk/external/common/wvpl/wvpl_sdk_environment.h

@@ -12,11 +12,13 @@
 #include <memory>
 #include <string>
 
-#include "common/drm_root_certificate.h"
 #include "sdk/external/common/wvpl/wvpl_types.h"
-#include "protos/public/device_certificate_status.pb.h"
-#include "protos/public/provisioned_device_info.pb.h"
 
+namespace widevine {
+class DeviceCertificateStatusList;
+class DrmRootCertificate;
+class ProvisionedDeviceInfo;
+}  // namespace widevine
 namespace widevine_server {
 namespace wv_pl_sdk {
 
@@ -38,8 +40,7 @@ const char kDrmCertificateType[] = "drm_certificate_type";
  */
 class WvPLSDKEnvironment {
  public:
-  virtual ~WvPLSDKEnvironment() {}
-  static void SetConfigValue(const std::map<std::string, std::string>& config_values);
+  virtual ~WvPLSDKEnvironment();
   // Generates a license response containing a message generated in response to
   // an error condition. |create_session_status| is a previous error status
   // returned by the CreateSession(). |license_response| points to a std::string to
@@ -87,6 +88,8 @@ class WvPLSDKEnvironment {
 
   WvPLStatus SetDeviceCertificateStatusList(const std::string& cert_list) const;
 
+  static void SetConfigValue(const std::map<std::string, std::string>& config_values);
+
   // Number of seconds until the certificate status list expires after its
   // creation time. Default value is 604800 seconds.
   uint32_t device_certificate_expiration_seconds_ = 604800;