Do not enable network technology if not available

We currently set a technology to 'enabling' even if it is not available.
We also enable / disable both Cellular and Wimax on the same UI element
since both are never expected to be available.
Simple fix is to ignore technologies that are not available.

BUG=368754

Review URL: https://codereview.chromium.org/336313002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277856 0039d316-1c4b-4281-b951-d872f2087c98

chromeos/network/network_state_handler.cc

@@ -124,6 +124,8 @@ void NetworkStateHandler::SetTechnologyEnabled(
       it != technologies.end(); ++it) {
     std::string* technology = *it;
     DCHECK(technology);
+    if (!shill_property_handler_->IsTechnologyAvailable(*technology))
+      continue;
     NET_LOG_USER("SetTechnologyEnabled",
                  base::StringPrintf("%s:%d", technology->c_str(), enabled));
     shill_property_handler_->SetTechnologyEnabled(