Allow OSExchangeData::Provider to be overridden at run time.

ui/base/dragdrop/os_exchange_data.cc

Index: ui/base/dragdrop/os_exchange_data.cc
diff --git a/ui/base/dragdrop/os_exchange_data.cc b/ui/base/dragdrop/os_exchange_data.cc
index 00e58191f39c2789d42e3711f3ae3681b121461c..bae9df1a8bbac41320474e70d632227d21f0a5bf 100644
--- a/ui/base/dragdrop/os_exchange_data.cc
+++ b/ui/base/dragdrop/os_exchange_data.cc
@@ -6,6 +6,7 @@
 
 #include "base/pickle.h"
 #include "build/build_config.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_factory.h"
 #include "url/gurl.h"
 
 namespace ui {
@@ -19,10 +20,12 @@ OSExchangeData::DownloadFileInfo::DownloadFileInfo(
 
 OSExchangeData::DownloadFileInfo::~DownloadFileInfo() {}
 
-OSExchangeData::OSExchangeData() : provider_(CreateProvider()) {
+OSExchangeData::OSExchangeData()
+    : provider_(OSExchangeDataProviderFactory::CreateProvider()) {
 }
 
-OSExchangeData::OSExchangeData(Provider* provider) : provider_(provider) {
+OSExchangeData::OSExchangeData(std::unique_ptr<Provider> provider)
+    : provider_(std::move(provider)) {
 }
 
 OSExchangeData::~OSExchangeData() {