shill: Update all mock proxies to fail DBus methods synchronously by default.

CL:215790 introduced a new mock action that allows mock dbus proxies to specify
default behaviour for DBus calls. That CL also updated some of the proxies
to fail all DBus calls synchronously. This is a follow up CL that sets similar
expectations for the remaining DBus proxies.

Also, set non-default expectations on one of the proxies in WiFiMainTest and
WiMaxTest.

BUG=chromium:411018
TEST=Run shill_unittest.

Change-Id: Ib5a605ae58750d91f714a33d0e1a3e4479b72154
Reviewed-on: https://chromium-review.googlesource.com/218726
Reviewed-by: Paul Stewart <pstew@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
diff --git a/mock_power_manager_proxy.cc b/mock_power_manager_proxy.cc
index 9836374..dc806d8 100644
--- a/mock_power_manager_proxy.cc
+++ b/mock_power_manager_proxy.cc
@@ -4,6 +4,10 @@
 
 #include "shill/mock_power_manager_proxy.h"
 
+#include "shill/testing.h"
+
+using testing::_;
+
 namespace shill {
 
 MockPowerManagerProxy::MockPowerManagerProxy() {}