Last_n: Do not save a snapshot of a closing tab.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
index fd99d14e1dc8091e7f3710431cab16d6eeb51afd..1bdfca59a8c5b2b66677132f7ce5015d28af227d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.java
@@ -441,6 +441,11 @@ public class OfflinePageBridge {
         nativeRegisterRecentTab(mNativeOfflinePageBridge, tabId);
     }
 
+    /** Tells the native side that the tab of |webContents| will be closed. */
+    void willCloseTab(WebContents webContents) {
+        nativeWillCloseTab(mNativeOfflinePageBridge, webContents);
+    }
+
     /** Tells the native side that a new tab has been removed for this profile. */
     void unregisterRecentTab(int tabId) {
         nativeUnregisterRecentTab(mNativeOfflinePageBridge, tabId);
@@ -519,6 +524,7 @@ public class OfflinePageBridge {
     private native void nativeCheckPagesExistOffline(long nativeOfflinePageBridge, Object[] urls,
             CheckPagesExistOfflineCallbackInternal callback);
     private native void nativeRegisterRecentTab(long nativeOfflinePageBridge, int tabId);
+    private native void nativeWillCloseTab(long nativeOfflinePageBridge, WebContents webContents);
     private native void nativeUnregisterRecentTab(long nativeOfflinePageBridge, int tabId);
     @VisibleForTesting
     native void nativeGetRequestsInQueue(