ui/base/dragdrop: Remove unused GetIAsyncOperation function.

No need to keep dead code :P

No functionality changes intended.

Bug: 1111591
Change-Id: I8288b9585071ba99f6834c8d8b3309228933237e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331637
Commit-Queue: Victor Costan <pwnall@chromium.org>
Auto-Submit: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793541}

ui/base/dragdrop/os_exchange_data_provider_win.cc

@@ -273,13 +273,6 @@ IDataObject* OSExchangeDataProviderWin::GetIDataObject(
       data_object();
 }
 
-// static
-IDataObjectAsyncCapability* OSExchangeDataProviderWin::GetIAsyncOperation(
-    const OSExchangeData& data) {
-  return static_cast<const OSExchangeDataProviderWin*>(&data.provider())->
-      async_operation();
-}
-
 OSExchangeDataProviderWin::OSExchangeDataProviderWin(IDataObject* source)
     : data_(new DataObjectImpl()),
       source_object_(source) {

ui/base/dragdrop/os_exchange_data_provider_win.h

@@ -118,8 +118,6 @@ class COMPONENT_EXPORT(UI_BASE) OSExchangeDataProviderWin
 
   static DataObjectImpl* GetDataObjectImpl(const OSExchangeData& data);
   static IDataObject* GetIDataObject(const OSExchangeData& data);
-  static IDataObjectAsyncCapability* GetIAsyncOperation(
-      const OSExchangeData& data);
 
   explicit OSExchangeDataProviderWin(IDataObject* source);
   OSExchangeDataProviderWin();