bug 671092 - Crash after failed attempt to extract libraries after update r=dougt

embedding/android/GeckoApp.java

@@ -262,12 +262,21 @@ abstract public class GeckoApp
         if (GeckoAppShell.getFreeSpace() > GeckoAppShell.kFreeSpaceThreshold &&
             (!libxulFile.exists() ||
              new File(getApplication().getPackageResourcePath()).lastModified()
-             >= libxulFile.lastModified()))
+             >= libxulFile.lastModified())) {
             surfaceView.mSplashStatusMsg =
                 getResources().getString(R.string.splash_screen_installing_libs);
-        else
+            File[] libs = cacheFile.listFiles(new FilenameFilter() {
+                public boolean accept(File dir, String name) {
+                    return name.endsWith(".so");
+                }
+            });
+            for (int i = 0; i < libs.length; i++) {
+                libs[i].delete();
+            }
+        } else {
             surfaceView.mSplashStatusMsg =
                 getResources().getString(R.string.splash_screen_loading);
+        }
         mLibLoadThread.start();
     }