Disable system suspend while downloading files on win32....

chrome/browser/download/download_file.h

Index: chrome/browser/download/download_file.h
===================================================================
--- chrome/browser/download/download_file.h	(revision 29355)
+++ chrome/browser/download/download_file.h	(working copy)
@@ -51,6 +51,7 @@
 #include "base/lock.h"
 #include "base/ref_counted.h"
 #include "base/timer.h"
+#include "chrome/browser/power_save_blocker.h"
 #include "googleurl/src/gurl.h"
 
 namespace net {
@@ -153,6 +154,9 @@
   // Whether the download is still receiving data.
   bool in_progress_;
 
+  // RAII handle to keep the system from sleeping while we're downloading.
+  PowerSaveBlocker dont_sleep_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadFile);
 };