Remove the declaration of the config_file flag from the launcher

Bug: 114301828
Test: builds
Change-Id: I643c30b4fdafd40de40a54453d17fac676c0026f
diff --git a/host/commands/launch/main.cc b/host/commands/launch/main.cc
index 989d0a9..f4abc78 100644
--- a/host/commands/launch/main.cc
+++ b/host/commands/launch/main.cc
@@ -183,7 +183,7 @@
 DEFINE_string(device_title, "", "Human readable name for the instance, "
               "used by the vnc_server for its server title");
 DEFINE_string(setupwizard_mode, "DISABLED",
-	      "One of DISABLED,OPTIONAL,REQUIRED");
+            "One of DISABLED,OPTIONAL,REQUIRED");
 
 DEFINE_string(qemu_binary,
               "/usr/bin/qemu-system-x86_64",
@@ -196,8 +196,6 @@
               vsoc::DefaultHostArtifactsPath("bin/host_region_e2e_test"),
               "Location of the region end to end test binary");
 
-DECLARE_string(config_file);
-
 namespace {
 const std::string kDataPolicyUseExisting = "use_existing";
 const std::string kDataPolicyCreateIfMissing = "create_if_missing";