Got rid of `removeImageForKey:` and `removeImageForKey:fromDisk:` that looked sync but were async. Left only the 2 async ones

SDWebImage/SDImageCache.h

@@ -181,13 +181,6 @@ typedef void(^SDWebImageCalculateSizeBlock)(NSUInteger fileCount, NSUInteger tot
 
 #pragma mark - Remove Ops
 
-/**
- * Remove the image from memory and disk cache asynchronously
- *
- * @param key The unique image cache key
- */
-- (void)removeImageForKey:(nullable NSString *)key;
-
 /**
  * Remove the image from memory and disk cache asynchronously
  *
@@ -196,14 +189,6 @@ typedef void(^SDWebImageCalculateSizeBlock)(NSUInteger fileCount, NSUInteger tot
  */
 - (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion;
 
-/**
- * Remove the image from memory and optionally disk cache asynchronously
- *
- * @param key      The unique image cache key
- * @param fromDisk Also remove cache entry from disk if YES
- */
-- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk;
-
 /**
  * Remove the image from memory and optionally disk cache asynchronously
  *

SDWebImage/SDImageCache.m

@@ -404,20 +404,11 @@ FOUNDATION_STATIC_INLINE NSUInteger SDCacheCostForImage(UIImage *image) {
 
 #pragma mark - Remove Ops
 
-- (void)removeImageForKey:(nullable NSString *)key {
-    [self removeImageForKey:key withCompletion:nil];
-}
-
 - (void)removeImageForKey:(nullable NSString *)key withCompletion:(nullable SDWebImageNoParamsBlock)completion {
     [self removeImageForKey:key fromDisk:YES withCompletion:completion];
 }
 
-- (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk {
-    [self removeImageForKey:key fromDisk:fromDisk withCompletion:nil];
-}
-
 - (void)removeImageForKey:(nullable NSString *)key fromDisk:(BOOL)fromDisk withCompletion:(nullable SDWebImageNoParamsBlock)completion {
-    
     if (key == nil) {
         return;
     }