Fixed broken callback to AppDelegate (#6800)

Fixed broken callback to AppDelegate after retrieving a dynamic link during fresh app start.
The AppDelegate call was broken in PR : #6517

Reverting to the old implementation of dynamic link passing to App delegate with changes to remove iOS 9 checks.
Using new "openURL" method instead of the deprecated one.
Clean up in the sample app pod file.

FirebaseDynamicLinks/Sources/FIRDynamicLinks.m

@@ -509,6 +509,15 @@ - (BOOL)handleIncomingCustomSchemeDeepLink:(NSURL *)url {
 }
 
 - (void)passRetrievedDynamicLinkToApplication:(NSURL *)url {
+  id<UIApplicationDelegate> applicationDelegate = [UIApplication sharedApplication].delegate;
+  if (applicationDelegate &&
+      [applicationDelegate respondsToSelector:@selector(application:openURL:options:)]) {
+    // pass url directly to application delegate to avoid hop into
+    // iOS handling of the universal links
+    [applicationDelegate application:[UIApplication sharedApplication] openURL:url options:@{}];
+    return;
+  }
+
   [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
 }
 

FirebaseDynamicLinks/Tests/Sample/Podfile

@@ -1,14 +1,10 @@
-# Uncomment the next line to define a global platform for your project
-# platform :ios, '9.0'
-
 target 'FDLBuilderTestAppObjC' do
-  # Comment the next line if you don't want to use dynamic frameworks
+  platform :ios, '10.0'
   use_frameworks!
-  pod 'FirebaseAnalytics'
+
   pod 'FirebaseCore', :path => '../../../'
-  pod 'FirebaseInstallations', :path => '../../../'
-  pod 'FirebaseInstanceID', :path => '../../../'
-  pod 'FirebaseDynamicLinks', :path => '../../../'
+  pod 'FirebaseCoreDiagnostics', :path => '../../../'
+  pod 'GoogleDataTransport', :path => '../../../'
   pod 'GoogleUtilities', :path => '../../../'
-
+  pod 'FirebaseDynamicLinks', :path => '../../../'
 end