Fix power monitor tests with network service.

Bug: 729848
Change-Id: Ic1fc3f01184585c79f75cd060d4ce94226affb29
Reviewed-on: https://chromium-review.googlesource.com/1027205Reviewed-by: Han Leon <leon.han@intel.com>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553530}

content/browser/power_monitor_browsertest.cc

@@ -119,10 +119,12 @@ class PowerMonitorTest : public ContentBrowserTest {
         DCHECK(RenderProcessHostImpl::GetSpareRenderProcessHostForTesting());
       }
     } else if (source_info.identity.name() == mojom::kUtilityServiceName) {
-      ++request_count_from_utility_;
-
-      DCHECK(utility_bound_closure_);
-      std::move(utility_bound_closure_).Run();
+      // If the network service is enabled, it will create utility processes
+      // without a utility closure.
+      if (utility_bound_closure_) {
+        ++request_count_from_utility_;
+        std::move(utility_bound_closure_).Run();
+      }
     } else if (source_info.identity.name() == mojom::kGpuServiceName) {
       ++request_count_from_gpu_;