Require Cocoapods 1.5.0 (#16443)

packages/flutter_tools/lib/src/ios/cocoapods.dart

@@ -38,6 +38,8 @@ class CocoaPods {
 
   Future<bool> get hasCocoaPods => exitsHappyAsync(<String>['pod', '--version']);
 
+  // TODO(mravn): Insist on 1.5.0 once build bots have that installed.
+  // Earlier versions do not work with Swift and static libraries.
   String get cocoaPodsMinimumVersion => '1.0.0';
 
   Future<String> get cocoaPodsVersionText async => (await runAsync(<String>['pod', '--version'])).processResult.stdout.trim();

packages/flutter_tools/templates/cocoapods/Podfile-swift

@@ -56,19 +56,10 @@ target 'Runner' do
   }
 end
 
-pre_install do |installer|
-  # workaround for https://github.com/CocoaPods/CocoaPods/issues/3289
-  Pod::Installer::Xcode::TargetValidator.send(:define_method, :verify_no_static_framework_transitive_dependencies) {}
-end
-
 post_install do |installer|
   installer.pods_project.targets.each do |target|
     target.build_configurations.each do |config|
       config.build_settings['ENABLE_BITCODE'] = 'NO'
     end
-    # workaround for https://github.com/CocoaPods/CocoaPods/issues/7463
-    target.headers_build_phase.files.each do |file|
-      file.settings = { 'ATTRIBUTES' => ['Public'] }
-    end
   end
 end