Remove TwitterAuthUI because its dependency TwitterKit is deprecated. (#650)

Author: Yue-Wang-Google

Auth/README.md

@@ -36,7 +36,6 @@ pod 'FirebaseUI/Auth'
 pod 'FirebaseUI/Email'
 pod 'FirebaseUI/Google'
 pod 'FirebaseUI/Facebook'
-pod 'FirebaseUI/Twitter'
 pod 'FirebaseUI/Phone'
 ```
 
@@ -48,7 +47,6 @@ Auth guides at the following links:
 - [Email and password](https://firebase.google.com/docs/auth/ios/password-auth#before_you_begin)
 - [Google](https://firebase.google.com/docs/auth/ios/google-signin#before_you_begin)
 - [Facebook](https://firebase.google.com/docs/auth/ios/facebook-login#before_you_begin)
-- [Twitter](https://firebase.google.com/docs/auth/ios/twitter-login#before_you_begin)
 - [Phone](https://firebase.google.com/docs/auth/ios/phone-auth#before_you_begin)
 
 ## Using FirebaseUI for Authentication
@@ -95,7 +93,6 @@ let providers: [FUIAuthProvider] = [
   FUIEmailAuth(),
   FUIGoogleAuth(),
   FUIFacebookAuth(),
-  FUITwitterAuth(),
   FUIPhoneAuth(authUI: FUIAuth.defaultAuthUI()),
 ]
 self.authUI?.providers = providers
@@ -111,7 +108,6 @@ NSArray<id<FUIAuthProvider>> *providers = @[
   [[FUIEmailAuth alloc] init],
   [[FUIGoogleAuth alloc] init],
   [[FUIFacebookAuth alloc] init],
-  [[FUITwitterAuth alloc] init],
   [[FUIPhoneAuth alloc] initWithAuthUI:[FUIAuth defaultAuthUI]]
 ];
 _authUI.providers = providers;

FirebaseUI.h

@@ -31,5 +31,4 @@ FOUNDATION_EXPORT const unsigned char FirebaseUIVersionString[];
 #import <FirebaseUI/FirebaseGoogleAuthUI.h>
 #import <FirebaseUI/FirebaseOAuthUI.h>
 #import <FirebaseUI/FirebasePhoneAuthUI.h>
-#import <FirebaseUI/FirebaseTwitterAuthUI.h>
 #import <FirebaseUI/FirebaseStorageUI.h>

FirebaseUI.podspec

@@ -148,15 +148,4 @@ Pod::Spec.new do |s|
     phone.xcconfig = { 'HEADER_SEARCH_PATHS' => '$(PODS_ROOT)/FirebaseUI/FirebasePhoneAuthUI' }
   end
 
-  s.subspec 'Twitter' do |twitter|
-    twitter.public_header_files = 'TwitterAuth/FirebaseTwitterAuthUI/*.h'
-    twitter.source_files = 'TwitterAuth/FirebaseTwitterAuthUI/*.{h,m}'
-    twitter.dependency 'FirebaseUI/Auth'
-    twitter.dependency 'TwitterKit', '~> 3.0'
-    twitter.platform = :ios, '9.0'
-    twitter.resource_bundle = {
-      'FirebaseTwitterAuthUI' => ['TwitterAuth/FirebaseTwitterAuthUI/**/*.{png,lproj}']
-    }
-    twitter.xcconfig = { 'HEADER_SEARCH_PATHS' => '$(PODS_ROOT)/FirebaseUI/FirebaseTwitterAuthUI' }
-  end
 end

README.md

@@ -38,9 +38,6 @@ pod 'FirebaseUI/Facebook', '~> 5.0'
 # Only pull in Google login features
 pod 'FirebaseUI/Google', '~> 5.0'
 
-# Only pull in Twitter login features
-pod 'FirebaseUI/Twitter', '~> 5.0'
-
 # Only pull in Phone Auth login features
 pod 'FirebaseUI/Phone', '~> 5.0'
 ```
@@ -92,7 +89,6 @@ Copy the `GoogleService-Info.plist` into the sample project folder (`samples/obj
 Go to `Project Settings -> Info tab -> Url Types` and update values for:
 	+ `REVERSED_CLIENT_ID` (get value from `GoogleService-Info.plist`)
 	+ `fb{your-app-id}` (put Facebook App Id)
-	+ `twitterkit-{consumer-key}` (put Twitter App Consumer key)
 
 1. Update `Info.plist` with Facebook configuration values
 	+ `FacebookAppID -> {your-app-id}` (put Facebook App Id)