Remove kDisableNewZIPUnpacker and kEnableChromevoxDeveloperOption

They are unused, and don't even have definitions.

BUG=None
TEST=try

Change-Id: Ife26905454428a93d1dde5603023fd50b067ae0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632625
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Auto-Submit: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844330}

chromeos/constants/chromeos_switches.h

@@ -85,7 +85,6 @@ COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kDisableLoginAnimations[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kDisableMachineCertRequest[];
-COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const char kDisableNewZIPUnpacker[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kDisableOOBEChromeVoxHintTimerForTesting[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
@@ -100,8 +99,6 @@ COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const char kEnableArc[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const char kEnableArcVm[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const char kEnableCastReceiver[];
-COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
-extern const char kEnableChromevoxDeveloperOption[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) extern const char kEnableConsumerKiosk[];
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const char kEnableTabletFormFactor[];