Remove unused global for old serverless testing

Author: paulb777

FirebaseRemoteConfig/Sources/RCNConfigFetch.h

@@ -56,9 +56,6 @@ typedef void (^RCNConfigFetcherTestBlock)(RCNConfigFetcherCompletion completion)
 /// Add the ability to update NSURLSession's timeout after a session has already been created.
 - (void)recreateNetworkSession;
 
-/// Sets the test block to mock the fetch response instead of performing the fetch task from server.
-+ (void)setGlobalTestBlock:(RCNConfigFetcherTestBlock)block;
-
 NS_ASSUME_NONNULL_END
 
 @end

FirebaseRemoteConfig/Sources/RCNFetch.m

@@ -67,8 +67,6 @@
 // Deprecated error code previously from FirebaseCore
 static const NSInteger FIRErrorCodeConfigFailed = -114;
 
-static RCNConfigFetcherTestBlock gGlobalTestBlock;
-
 #pragma mark - RCNConfig
 
 @implementation RCNConfigFetch {
@@ -516,23 +514,13 @@ - (void)fetchWithUserProperties:(NSDictionary *)userProperties
     return;
   }
 
-  if (gGlobalTestBlock) {
-    gGlobalTestBlock(fetcherCompletion);
-    return;
-  }
   FIRLogDebug(kFIRLoggerRemoteConfig, @"I-RCN000061", @"Making remote config fetch.");
 
   NSURLSessionDataTask *dataTask = [self URLSessionDataTaskWithContent:compressedContent
                                                      completionHandler:fetcherCompletion];
   [dataTask resume];
 }
 
-+ (void)setGlobalTestBlock:(RCNConfigFetcherTestBlock)block {
-  FIRLogDebug(kFIRLoggerRemoteConfig, @"I-RCN000027",
-              @"Set global test block for NSSessionFetcher, it will not fetch from server.");
-  gGlobalTestBlock = [block copy];
-}
-
 - (NSString *)constructServerURL {
   NSString *serverURLStr = [[NSString alloc] initWithString:kServerURLDomain];
   serverURLStr = [serverURLStr stringByAppendingString:kServerURLVersion];