[views-mus] Prevent creating a native OzonePlatform in mus tests.

ui/base/dragdrop/os_exchange_data_provider_factory.cc

Index: ui/base/dragdrop/os_exchange_data_provider_factory.cc
diff --git a/ui/base/dragdrop/os_exchange_data_provider_factory.cc b/ui/base/dragdrop/os_exchange_data_provider_factory.cc
index 147cebfc6ea134a70bb453b685622429ccae1c9b..962fd2c5748e4969b4c72eec0c3c0aa715b01d1c 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_factory.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_factory.cc
@@ -26,6 +26,14 @@ void OSExchangeDataProviderFactory::SetFactory(Factory* factory) {
   factory_ = factory;
 }
 
+// static
+OSExchangeDataProviderFactory::Factory*
+OSExchangeDataProviderFactory::TakeFactory() {
+  OSExchangeDataProviderFactory::Factory* to_return = factory_;
+  factory_ = nullptr;
+  return to_return;
+}
+
 //static
 std::unique_ptr<OSExchangeData::Provider>
 OSExchangeDataProviderFactory::CreateProvider() {