[Offline pages] Removing permission prompt when accessing offline page

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java
index 044f6053657d5cfd3182c53690d1b98a7a55b5e5..2b29bcbdc228be35f29a89ebe71d8e53b0c25641 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationHandler.java
@@ -22,6 +22,7 @@ import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.offlinepages.OfflinePageUtils;
 import org.chromium.chrome.browser.util.IntentUtils;
 import org.chromium.chrome.browser.util.UrlUtilities;
 import org.chromium.ui.base.PageTransition;
@@ -172,12 +173,16 @@ public class ExternalNavigationHandler {
         // If accessing a file URL, ensure that the user has granted the necessary file access
         // to Chrome.  This check should happen for reloads, navigations, etc..., which is why
         // it occurs before the subsequent blocks.
-        if (params.getUrl().startsWith("file:")
-                && mDelegate.shouldRequestFileAccess(params.getTab())) {
-            mDelegate.startFileIntent(
-                    intent, params.getReferrerUrl(), params.getTab(),
-                    params.shouldCloseContentsOnOverrideUrlLoadingAndLaunchIntent());
-            return OverrideUrlLoadingResult.OVERRIDE_WITH_ASYNC_ACTION;
+        if (params.getUrl().startsWith("file:")) {
+            // If accessing a file URL, which points to inside of an offline copy archive, there
+            // is no need to override the navigation.
+            if (OfflinePageUtils.isOfflineUrlForStoragePermissionCheck(params.getUrl())) {
+                return OverrideUrlLoadingResult.NO_OVERRIDE;
+            } else if (mDelegate.shouldRequestFileAccess(params.getTab())) {
+                mDelegate.startFileIntent(intent, params.getReferrerUrl(), params.getTab(),
+                        params.shouldCloseContentsOnOverrideUrlLoadingAndLaunchIntent());
+                return OverrideUrlLoadingResult.OVERRIDE_WITH_ASYNC_ACTION;
+            }
         }
 
         // http://crbug/331571 : Do not override a navigation started from user typing.