Fix null-pointer deref in ExternalNavigationDelegateImpl

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

Index: chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
index 9c6eb433cf4f74439489bc3c233f11bf1ddd851e..21d792c8662636ed0b1fe78407cd04820781784e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
@@ -136,7 +136,7 @@ public class ExternalNavigationDelegateImpl implements ExternalNavigationDelegat
     }
 
     private static boolean isPdfIntent(Intent intent) {
-        if (intent == null) return false;
+        if (intent == null || intent.getData() == null) return false;
         String filename = intent.getData().getLastPathSegment();
         return (filename != null && filename.endsWith(PDF_SUFFIX))
                 || PDF_MIME.equals(intent.getType());