Revert "Rename getTokenWithHandler"

Since the renamed protocol is breaking people and is not general enough, we revert the rename and leave the work to interceptor

This reverts commit 92db5fc724.

src/objective-c/GRPCClient/GRPCCall.m

@@ -885,7 +885,7 @@ const char *kCFStreamVarName = "grpc_cfstream";
     @synchronized(self) {
       self.isWaitingForToken = YES;
     }
-    void (^tokenHandler)(NSString *token) = ^(NSString *token) {
+    [_callOptions.authTokenProvider getTokenWithHandler:^(NSString *token) {
       @synchronized(self) {
         if (self.isWaitingForToken) {
           if (token) {
@@ -895,17 +895,7 @@ const char *kCFStreamVarName = "grpc_cfstream";
           self.isWaitingForToken = NO;
         }
       }
-    };
-    id<GRPCAuthorizationProtocol> authTokenProvider = _callOptions.authTokenProvider;
-    if ([authTokenProvider respondsToSelector:@selector(provideTokenToHandler:)]) {
-      [_callOptions.authTokenProvider provideTokenToHandler:tokenHandler];
-    } else {
-      NSAssert([authTokenProvider respondsToSelector:@selector(getTokenWithHandler:)],
-               @"authTokenProvider has no usable method");
-      if ([authTokenProvider respondsToSelector:@selector(getTokenWithHandler:)]) {
-        [_callOptions.authTokenProvider getTokenWithHandler:tokenHandler];
-      }
-    }
+    }];
   } else {
     [self startCallWithWriteable:writeable];
   }

src/objective-c/GRPCClient/GRPCCallOptions.h

@@ -60,22 +60,12 @@ typedef NS_ENUM(NSUInteger, GRPCTransportType) {
 /**
  * Implement this protocol to provide a token to gRPC when a call is initiated.
  */
-@protocol GRPCAuthorizationProtocol<NSObject>
-
-@optional
+@protocol GRPCAuthorizationProtocol
 
 /**
  * This method is called when gRPC is about to start the call. When OAuth token is acquired,
  * \a handler is expected to be called with \a token being the new token to be used for this call.
  */
-- (void)provideTokenToHandler:(void (^)(NSString *_Nullable token))handler;
-
-/**
- * This method is deprecated. Please use \a provideTokenToHandler.
- *
- * This method is called when gRPC is about to start the call. When OAuth token is acquired,
- * \a handler is expected to be called with \a token being the new token to be used for this call.
- */
 - (void)getTokenWithHandler:(void (^)(NSString *_Nullable token))handler;
 
 @end

src/objective-c/ProtoRPC/ProtoRPC.m

@@ -175,7 +175,7 @@ static NSError *ErrorForBadProto(id proto, Class expectedClass, NSError *parsing
 }
 
 - (void)writeMessage:(GPBMessage *)message {
-  NSAssert([message isKindOfClass:[GPBMessage class]], @"Parameter message must be a GPBMessage");
+  NSAssert([message isKindOfClass:[GPBMessage class]]);
   if (![message isKindOfClass:[GPBMessage class]]) {
     NSLog(@"Failed to send a message that is non-proto.");
     return;

src/objective-c/tests/APIv2Tests/APIv2Tests.m

@@ -241,7 +241,7 @@ static const NSTimeInterval kTestTimeout = 16;
   [self waitForExpectationsWithTimeout:kTestTimeout handler:nil];
 }
 
-- (void)provideTokenToHandler:(void (^)(NSString *token))handler {
+- (void)getTokenWithHandler:(void (^)(NSString *token))handler {
   dispatch_queue_t queue = dispatch_queue_create(NULL, DISPATCH_QUEUE_SERIAL);
   dispatch_sync(queue, ^{
     handler(@"test-access-token");