Revert of Tablet-like power button behavior on Convertible/Tablet ChromeOS devices

chromeos/dbus/fake_power_manager_client.cc

Index: chromeos/dbus/fake_power_manager_client.cc
diff --git a/chromeos/dbus/fake_power_manager_client.cc b/chromeos/dbus/fake_power_manager_client.cc
index db6747d5d01e324500c708946df52cc688b6b7ba..6bee1ea7369bfc50732bb4412c02ed2ee6ce210e 100644
--- a/chromeos/dbus/fake_power_manager_client.cc
+++ b/chromeos/dbus/fake_power_manager_client.cc
@@ -14,7 +14,7 @@
 
 namespace {
 // Minimum power for a USB power source to be classified as AC.
-constexpr double kUsbMinAcWatts = 24;
+const double kUsbMinAcWatts = 24;
 }
 
 FakePowerManagerClient::FakePowerManagerClient()
@@ -183,12 +183,6 @@
     observer.DarkSuspendImminent();
 }
 
-void FakePowerManagerClient::SendBrightnessChanged(int level,
-                                                   bool user_initiated) {
-  for (auto& observer : observers_)
-    observer.BrightnessChanged(level, user_initiated);
-}
-
 void FakePowerManagerClient::SendPowerButtonEvent(
     bool down,
     const base::TimeTicks& timestamp) {