Fix log error for progress going backwards in Plugin VM installer

Bug: b:169973809
Change-Id: I2cd308d0805a7f7009f539572a8e0437069fe9d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459547
Commit-Queue: Timothy Loh <timloh@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Timothy Loh <timloh@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815023}

chrome/browser/chromeos/plugin_vm/plugin_vm_installer.cc

@@ -490,7 +490,7 @@ void PluginVmInstaller::UpdateProgress(double state_progress) {
       start_range + (end_range - start_range) * state_progress;
   if (new_progress < progress_) {
     LOG(ERROR) << "Progress went backwards from " << progress_ << " to "
-               << progress_;
+               << new_progress;
     return;
   }