Minimal implementation of Widevine MediaCAS ECMG.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=226515998

example/BUILD

@@ -16,6 +16,7 @@ package(
 filegroup(
     name = "binary_release_files",
     srcs = [
+        "test_ecmg_messages.h",
         "wv_cas_ecm_example.cc",
         ":wv_cas_ecm_example",
     ],
@@ -26,20 +27,9 @@ cc_library(
     hdrs = ["constants.h"],
 )
 
-cc_binary(
-    name = "simulcrypt_client",
-    srcs = ["simulcrypt_client.cc"],
-    deps = [
-        "//base",
-    ],
-)
-
 cc_library(
-    name = "test_simulcrypt_messages",
-    hdrs = ["test_simulcrypt_messages.h"],
-    deps = [
-        "//base",
-    ],
+    name = "test_ecmg_messages",
+    hdrs = ["test_ecmg_messages.h"],
 )
 
 cc_binary(
@@ -57,7 +47,7 @@ cc_binary(
     srcs = ["wv_cas_key_fetcher_example.cc"],
     deps = [
         "//base",
-        "//util:status",
+        "//common:status",
         "//media_cas_packager_sdk/public:wv_cas_key_fetcher",
         "//protos/public:media_cas_encryption_proto",
     ],