Don't send Quirks Server requests for product_id = 0

ash/display/display_color_manager_chromeos_unittest.cc

Index: ash/display/display_color_manager_chromeos_unittest.cc
diff --git a/ash/display/display_color_manager_chromeos_unittest.cc b/ash/display/display_color_manager_chromeos_unittest.cc
index 36314933729ee3748dc38f1b8b6381b04b1a1263..86a84971f5dbcc398fe0a6f51d97e4c9a5ff0627 100644
--- a/ash/display/display_color_manager_chromeos_unittest.cc
+++ b/ash/display/display_color_manager_chromeos_unittest.cc
@@ -297,7 +297,8 @@ TEST_F(DisplayColorManagerTest, NoMatchProductID) {
   EXPECT_TRUE(
       base::MatchPattern(log_->GetActionsAndClear(), kResetGammaAction));
 
-  WaitOnColorCalibration();
+  // NOTE: If product_id == 0, there is no thread switching in Quirks or Display
+  // code, so we shouldn't call WaitOnColorCalibration().
   EXPECT_STREQ("", log_->GetActionsAndClear().c_str());
 }