Slight change to surface API.

src/objective-c/CronetFramework.podspec

@@ -35,7 +35,7 @@ Pod::Spec.new do |s|
   s.homepage     = "http://chromium.org"
   s.license      = { :type => 'BSD' }
   s.vendored_framework = "Cronet.framework"
-  s.author             = ""
+  s.author             = "The Chromium Authors"
   s.ios.deployment_target = "8.0"
   s.source       = { :http => 'https://storage.googleapis.com/grpc-precompiled-binaries/cronet/Cronet.framework.zip' }
   s.preserve_paths = "Cronet.framework"

src/objective-c/GRPCClient/GRPCCall+Cronet.h

@@ -39,8 +39,7 @@
  */
 @interface GRPCCall (Cronet)
 
-+(void) setUseCronet:(BOOL) useCronet
++(void)useCronet:(cronet_engine *)cronet_engine;
-                    :(cronet_engine *)cronet_engine;
 
 +(void *)getCronetEngine;
 

src/objective-c/GRPCClient/GRPCCall+Cronet.m

@@ -38,9 +38,8 @@ static void *g_cronet_engine;
 
 @implementation GRPCCall (Cronet)
 
-+ (void)setUseCronet:(BOOL)useCronet
++ (void)useCronet:(cronet_engine *)cronet_engine {
-                    :(cronet_engine *)cronet_engine {
+  use_cronet = YES;
-  use_cronet = useCronet;
   g_cronet_engine = cronet_engine;
 }
 

src/objective-c/tests/InteropTests.m

@@ -98,7 +98,7 @@ static cronet_engine *_engine = NULL;
     [Cronet setSslKeyLogFileName:@"cronetkeylogfile.pem"];
     [Cronet start];
     _engine = [Cronet getGlobalEngine];
-    [GRPCCall setUseCronet:true :_engine];
+    [GRPCCall useCronet:_engine];
   }
 #endif
 }