Update references to the extension messaging APIs to point to the "runtime"

chrome/browser/resources/file_manager/js/file_copy_manager.js

Index: chrome/browser/resources/file_manager/js/file_copy_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_copy_manager.js b/chrome/browser/resources/file_manager/js/file_copy_manager.js
index 74435a240836f83440d25e90491aaaef553c3866..a5fb156c7eb2db7b0f639b2b7ad66d6512a30ae5 100644
--- a/chrome/browser/resources/file_manager/js/file_copy_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_copy_manager.js
@@ -916,9 +916,9 @@ FileCopyManager.prototype.serviceNextTaskEntry_ = function(
 
       function onFileTransferCompleted() {
         self.cancelCallback_ = null;
-        if (chrome.extension.lastError) {
+        if (chrome.runtime.lastError) {
           onFailTransfer({
-            code: chrome.extension.lastError.message,
+            code: chrome.runtime.lastError.message,
             toGDrive: task.targetOnGData,
             sourceFileUrl: sourceFileUrl
           });