Revert of Showing previews UI for Offline Previews

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 c0a27ec49c72c028324b2ad90a6c7dd266e5111b..f60a6d45df3fa42c959a7d30e57ec4231b27824e 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
@@ -545,16 +545,6 @@
         return offlinePageBridge.getOfflinePageHeaderForReload(tab.getWebContents());
     }
 
-    /**
-     * @return True if an offline preview is being shown.
-     * @param tab The current tab.
-     */
-    public static boolean isShowingOfflinePreview(Tab tab) {
-        OfflinePageBridge offlinePageBridge = getInstance().getOfflinePageBridge(tab.getProfile());
-        if (offlinePageBridge == null) return false;
-        return offlinePageBridge.isShowingOfflinePreview(tab.getWebContents());
-    }
-
     private static boolean isPowerConnected(Intent batteryStatus) {
         int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
         boolean isConnected = (status == BatteryManager.BATTERY_STATUS_CHARGING