Fixing remaining VC++ 2015 64-bit build breaks

content/common/sandbox_win.cc

Index: content/common/sandbox_win.cc
diff --git a/content/common/sandbox_win.cc b/content/common/sandbox_win.cc
index 88f703cef3388f99df46ec9f4a951c33c4793fc1..a9dd79a834fed4addfe0b5a9d36b916ad90277cc 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -38,6 +38,9 @@
 #include "sandbox/win/src/win_utils.h"
 #include "ui/gfx/win/direct_write.h"
 
+#if defined(OS_WIN)
+#include "base/win/win_util.h"
+#endif
 static sandbox::BrokerServices* g_broker_services = NULL;
 static sandbox::TargetServices* g_target_services = NULL;
 
@@ -747,8 +750,9 @@ base::Process StartSandboxedProcess(
       if (direct_write_font_cache_section.Open(name, true)) {
         void* shared_handle = policy->AddHandleToShare(
             direct_write_font_cache_section.handle().GetHandle());
-        cmd_line->AppendSwitchASCII(switches::kFontCacheSharedHandle,
-            base::UintToString(reinterpret_cast<unsigned int>(shared_handle)));
+        cmd_line->AppendSwitchASCII(
+            switches::kFontCacheSharedHandle,
+            base::UintToString(base::win::HandleToUint32(shared_handle)));
       }
     }
   }