[fuchsia] Remove `address_counter` from network interface name.

This change crrev.com/c/2380329 added an index to the interface name,
following this now-deleted comment:

  // Interfaces with more than one IPv6 address will yield multiple
  // NetworkInterface objects, with friendly names to distinguish the
  // different IPs (e.g. "wlan" with three IPv6 IPs yields wlan-0,
  // wlan-1, wlan-2).

This comment was incorrectly describing the previous behavior, and
clients relied on `interface_name` not including an index.

Bug: b/171599542
Bug: fuchsia:21155
Change-Id: Ied6972f15546a8f022f486e8c049bdf1dfb1e819
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586317
Commit-Queue: Peter Johnston <peterjohnston@google.com>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837136}

net/base/network_interfaces_fuchsia.cc

@@ -81,7 +81,6 @@ bool InterfaceProperties::Update(
 
 void InterfaceProperties::AppendNetworkInterfaces(
     NetworkInterfaceList* interfaces) const {
-  uint32_t address_counter = 1;
   for (const auto& fidl_address : properties_.addresses()) {
     IPAddress address = FuchsiaIpAddressToIPAddress(fidl_address.addr().addr);
     if (address.empty()) {
@@ -93,11 +92,8 @@ void InterfaceProperties::AppendNetworkInterfaces(
     // TODO(crbug.com/1131220): Set correct attributes once available in
     // fuchsia::net::interfaces::Properties.
     const int kAttributes = 0;
-    std::string interface_name = base::StringPrintf(
-        "%s-%d", properties_.name().c_str(), address_counter);
-    address_counter++;
     interfaces->emplace_back(
-        interface_name, interface_name, properties_.id(),
+        properties_.name(), properties_.name(), properties_.id(),
         internal::ConvertConnectionType(properties_.device_class()),
         std::move(address), fidl_address.addr().prefix_len, kAttributes);
   }