Move AddMultipartValueForUpload to net/base/mime_util.h/cc.

chrome/common/cloud_print/cloud_print_helpers.h

Index: chrome/common/cloud_print/cloud_print_helpers.h
diff --git a/chrome/common/cloud_print/cloud_print_helpers.h b/chrome/common/cloud_print/cloud_print_helpers.h
index 71bd9b6446ecccdcb4a5b55909299c571f68a5f7..23a9f8f10ad75043c43743f66bcc502dd30073d7 100644
--- a/chrome/common/cloud_print/cloud_print_helpers.h
+++ b/chrome/common/cloud_print/cloud_print_helpers.h
@@ -63,13 +63,6 @@ scoped_ptr<base::DictionaryValue> ParseResponseJSON(
     const std::string& response_data,
     bool* succeeded);
 
-// Prepares one value as part of a multi-part upload request.
-void AddMultipartValueForUpload(const std::string& value_name,
-                                const std::string& value,
-                                const std::string& mime_boundary,
-                                const std::string& content_type,
-                                std::string* post_data);
-
 // Returns the MIME type of multipart with |mime_boundary|.
 std::string GetMultipartMimeType(const std::string& mime_boundary);