Remove deprecated RCTImageSource method

Reviewed By: majak

Differential Revision: D3755010

fbshipit-source-id: a1c4cfa066c51ec0111378a1b4e08f58b92e6cbd

React/Base/RCTImageSource.h

@@ -36,13 +36,6 @@
 
 @end
 
-@interface RCTImageSource (Deprecated)
-
-@property (nonatomic, strong, readonly) NSURL *imageURL
-__deprecated_msg("Use request.URL instead.");
-
-@end
-
 @interface RCTConvert (ImageSource)
 
 + (RCTImageSource *)RCTImageSource:(id)json;

React/Base/RCTImageSource.m

@@ -48,16 +48,6 @@
 
 @end
 
-
-@implementation RCTImageSource (Deprecated)
-
-- (NSURL *)imageURL
-{
-  return self.request.URL;
-}
-
-@end
-
 @implementation RCTConvert (ImageSource)
 
 + (RCTImageSource *)RCTImageSource:(id)json