Remove deprecated FlutterInit. (flutter/engine#3550)

engine/src/flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h

@@ -23,13 +23,4 @@ FLUTTER_EXPORT
 - (void)handleStatusBarTouches:(UIEvent*)event;
 @end
 
-__BEGIN_DECLS
-
-// Initializes Flutter for this process. Need only be called once per process.
-FLUTTER_EXPORT void FlutterInit(int argc, const char* argv[])
-    __attribute__((deprecated("This call is no longer necessary and will be "
-                              "removed in an upcoming release.")));
-
-__END_DECLS
-
 #endif  // FLUTTER_FLUTTERVIEWCONTROLLER_H_

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm

@@ -54,10 +54,6 @@ class PlatformMessageResponseDarwin : public blink::PlatformMessageResponse {
                                     FlutterTextInputDelegate>
 @end
 
-void FlutterInit(int argc, const char* argv[]) {
-  // Deprecated. To be removed.
-}
-
 @implementation FlutterViewController {
   fml::scoped_nsprotocol<FlutterDartProject*> _dartProject;
   UIInterfaceOrientationMask _orientationPreferences;