[Android] Add app version code to chrome://version.

base/android/java/src/org/chromium/base/BuildInfo.java

Index: base/android/java/src/org/chromium/base/BuildInfo.java
diff --git a/base/android/java/src/org/chromium/base/BuildInfo.java b/base/android/java/src/org/chromium/base/BuildInfo.java
index 23140519b516a9e51ab58cbac72b50a0c3c48869..81a8f3455906f37ec26b553e1ae786a35805a90d 100644
--- a/base/android/java/src/org/chromium/base/BuildInfo.java
+++ b/base/android/java/src/org/chromium/base/BuildInfo.java
@@ -67,7 +67,10 @@ public class BuildInfo {
         try {
             PackageManager pm = context.getPackageManager();
             PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
-            msg = "" + pi.versionCode;
+            msg = "";
+            if (pi.versionCode > 0) {
+                msg = Integer.toString(pi.versionCode);
+            }
         } catch (NameNotFoundException e) {
             Log.d(TAG, msg);
         }