Initial work to move downloads to ContentIds

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadServiceDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/DownloadServiceDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadServiceDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadServiceDelegate.java
index 27a518c27259c3c3c78a3b39a34712aa7ca94555..40202e1c1a6b5663d885fba8c0a56675be2d339b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadServiceDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/DownloadServiceDelegate.java
@@ -4,29 +4,32 @@
 
 package org.chromium.chrome.browser.download;
 
+import org.chromium.components.offline_items_collection.ContentId;
+
 /** Interface for classes implementing concrete implementation of UI behavior. */
 public interface DownloadServiceDelegate {
     /**
      * Called to cancel a download.
-     * @param downloadGuid GUID of the download.
+     * @param id The {@link ContentId} of the download to cancel.
      * @param isOffTheRecord Whether the download is off the record.
      */
-    void cancelDownload(String downloadGuid, boolean isOffTheRecord);
+    void cancelDownload(ContentId id, boolean isOffTheRecord);
 
     /**
      * Called to pause a download.
-     * @param downloadGuid GUID of the download.
+     * @param id The {@link ContentId} of the download to pause.
      * @param isOffTheRecord Whether the download is off the record.
      */
-    void pauseDownload(String downloadGuid, boolean isOffTheRecord);
+    void pauseDownload(ContentId id, boolean isOffTheRecord);
 
     /**
      * Called to resume a paused download.
+     * @param id The {@link ContentId} of the download to cancel.
      * @param item Download item to resume.
      * @param hasUserGesture Whether the resumption is triggered by user gesture.
      * TODO(fgorski): Update the interface to not require download item.
      */
-    void resumeDownload(DownloadItem item, boolean hasUserGesture);
+    void resumeDownload(ContentId id, DownloadItem item, boolean hasUserGesture);
 
     /** Called to destroy the delegate, in case it needs to be destroyed. */
     void destroyServiceDelegate();