IOSAD-172 Back out: Password entry has isExpired

pEpObjCAdapter/PEPPassphraseCacheEntry.h

@@ -19,10 +19,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (instancetype)initWithPassphrase:(NSString *)passphrase;
 
-/// @Return `YES` when the entry has expired (has passed the compiled-in timeout),
-/// `NO` otherwise.
-- (BOOL)isExpired;
-
 @end
 
 NS_ASSUME_NONNULL_END

pEpObjCAdapter/PEPPassphraseCacheEntry.m

@@ -8,8 +8,6 @@
 
 #import "PEPPassphraseCacheEntry.h"
 
-static NSTimeInterval s_defaultTimeoutInSeconds = 10 * 60;
-
 @implementation PEPPassphraseCacheEntry
 
 - (instancetype)initWithPassphrase:(NSString *)passphrase
@@ -22,9 +20,4 @@ static NSTimeInterval s_defaultTimeoutInSeconds = 10 * 60;
     return self;
 }
 
-- (BOOL)isExpired
-{
-    return NO;
-}
-
 @end