Add a dummy variable to ResourceMsg_DataReceived.

content/browser/loader/resource_dispatcher_host_unittest.cc

Index: content/browser/loader/resource_dispatcher_host_unittest.cc
diff --git a/content/browser/loader/resource_dispatcher_host_unittest.cc b/content/browser/loader/resource_dispatcher_host_unittest.cc
index 59045599dece613d9722525bae6a2ecf1db6d29b..58635fd9382015191b9794e0cc6cf7a7514187cc 100644
--- a/content/browser/loader/resource_dispatcher_host_unittest.cc
+++ b/content/browser/loader/resource_dispatcher_host_unittest.cc
@@ -1154,6 +1154,11 @@ testing::AssertionResult ExtractDataOffsetAndLength(const IPC::Message& message,
   int request_id;
   if (!IPC::ReadParam(&message, &iter, &request_id))
     return testing::AssertionFailure() << "Could not read request_id";
+  // TODO(erikchen): This dummy variable is temporary and is only intended to be
+  // present for one Canary release. http://crbug.com/527588.
+  int dummy;
+  if (!IPC::ReadParam(&message, &iter, &dummy))
+    return testing::AssertionFailure() << "Could not read dummy variable";
   if (!IPC::ReadParam(&message, &iter, data_offset))
     return testing::AssertionFailure() << "Could not read data_offset";
   if (!IPC::ReadParam(&message, &iter, data_length))