Fix #includes in components/proximity_auth/cryptauth.

components/proximity_auth/switches.h

Index: components/proximity_auth/switches.h
diff --git a/components/proximity_auth/switches.h b/components/proximity_auth/switches.h
index 976285a9f9972ec27c7b5a763c6d7507d1a0d523..d7c6207de85e2665cc932c4b11adce0b252d65d9 100644
--- a/components/proximity_auth/switches.h
+++ b/components/proximity_auth/switches.h
@@ -8,9 +8,6 @@
 namespace proximity_auth {
 namespace switches {
 
-// All switches in alphabetical order. The switches should be documented
-// alongside the definition of their values in the .cc file.
-extern const char kCryptAuthHTTPHost[];
 extern const char kEnableBluetoothLowEnergyDiscovery[];
 extern const char kEnableProximityDetection[];
 extern const char kForceLoadEasyUnlockAppInTests[];