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..7aa08e9993b9915280ae9e1766237376f4aa9ec5 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 {
@@ -19,7 +20,8 @@ OSExchangeData::DownloadFileInfo::DownloadFileInfo(
 
 OSExchangeData::DownloadFileInfo::~DownloadFileInfo() {}
 
-OSExchangeData::OSExchangeData() : provider_(CreateProvider()) {
+OSExchangeData::OSExchangeData()
+    : provider_(OSExchangeDataProviderFactory::CreateProvider()) {
 }
 
 OSExchangeData::OSExchangeData(Provider* provider) : provider_(provider) {