Makes the OfflinePageBridge.getAllPages method asynchronous.

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
index 7ecfa903e0504e9d55c7507c6414b5619c37a561..424267d6e1c43c0f84783bef0e4378926f7ca8c7 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageUtils.java
@@ -8,6 +8,7 @@ import android.app.Activity;
 import android.content.Context;
 import android.os.Environment;
 
+import org.chromium.base.Callback;
 import org.chromium.base.Log;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
@@ -242,8 +243,20 @@ public class OfflinePageUtils {
             @Override
             public void onAction(Object actionData) {
                 RecordUserAction.record("OfflinePages.SaveStatusSnackbar.FreeUpSpaceButtonClicked");
-                OfflinePageStorageSpacePolicy policy =
-                        new OfflinePageStorageSpacePolicy(offlinePageBridge);
+                Callback<OfflinePageStorageSpacePolicy> callback =
+                        getStorageSpacePolicyCallback(offlinePageBridge, snackbarManager, activity);
+
+                OfflinePageStorageSpacePolicy.create(offlinePageBridge, callback);
+            }
+        };
+    }
+
+    private static Callback<OfflinePageStorageSpacePolicy> getStorageSpacePolicyCallback(
+            final OfflinePageBridge offlinePageBridge, final SnackbarManager snackbarManager,
+            final Activity activity) {
+        return new Callback<OfflinePageStorageSpacePolicy>() {
+            @Override
+            public void onResult(OfflinePageStorageSpacePolicy policy) {
                 if (policy.hasPagesToCleanUp()) {
                     OfflinePageFreeUpSpaceCallback callback = new OfflinePageFreeUpSpaceCallback() {
                         @Override