update_engine: Remove references to bluetooth and wimax

Shill does not support bluetooth (kTypeBluetooth is left over from the
flimflam API) and has stopped supporting Wimax.

BUG=chromium:954635
TEST=`FEATURES="test" emerge-$BOARD update_engine update_engine-client`

Change-Id: I3e7d4f0b0a7625067585b6f9fdeec196b87f7026
Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/system/update_engine/+/1752329
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Tested-by: Alex Khouderchah <akhouderchah@chromium.org>
Commit-Queue: Alex Khouderchah <akhouderchah@chromium.org>
diff --git a/update_manager/chromeos_policy.cc b/update_manager/chromeos_policy.cc
index 08c355e..12d443d 100644
--- a/update_manager/chromeos_policy.cc
+++ b/update_manager/chromeos_policy.cc
@@ -457,7 +457,7 @@
 // TODO(garnold) The current logic generally treats the list of allowed
 // connections coming from the device policy as a whitelist, meaning that it
 // can only be used for enabling connections, but not disable them. Further,
-// certain connection types (like Bluetooth) cannot be enabled even by policy.
+// certain connection types cannot be enabled even by policy.
 // In effect, the only thing that device policy can change is to enable
 // updates over a cellular network (disabled by default). We may want to
 // revisit this semantics, allowing greater flexibility in defining specific
@@ -488,10 +488,6 @@
   *result = true;
   bool device_policy_can_override = false;
   switch (conn_type) {
-    case ConnectionType::kBluetooth:
-      *result = false;
-      break;
-
     case ConnectionType::kCellular:
       *result = false;
       device_policy_can_override = true;