Adds imageWriterPrivate support for Windows

chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.cc

Index: chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.cc
diff --git a/chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.cc b/chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.cc
index 94b267570fe0648885c2d2c7e36335914cfa5e20..9c1871b07ff978e66898d443c6df732c07488565 100644
--- a/chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.cc
+++ b/chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.cc
@@ -5,6 +5,7 @@
 #include "base/file_util.h"
 #include "chrome/browser/extensions/api/image_writer_private/destroy_partitions_operation.h"
 #include "chrome/browser/extensions/api/image_writer_private/error_messages.h"
+#include "content/public/browser/browser_thread.h"
 
 namespace extensions {
 namespace image_writer {
@@ -37,7 +38,12 @@ void DestroyPartitionsOperation::StartImpl() {
     return;
   }
 
-  Write(base::Bind(&DestroyPartitionsOperation::Finish, this));
+  content::BrowserThread::PostTask(
+      content::BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(&DestroyPartitionsOperation::Write,
+                 this,
+                 base::Bind(&DestroyPartitionsOperation::Finish, this)));
 }
 
 }  // namespace image_writer