Don't use String8::empty

Bug: 295394788
Test: mma
Change-Id: Ic9d5a4f4371c6a8fe88d19528c263b1ed22e60c9
diff --git a/tools/aapt/Command.cpp b/tools/aapt/Command.cpp
index d02fd83..51cf38b 100644
--- a/tools/aapt/Command.cpp
+++ b/tools/aapt/Command.cpp
@@ -353,8 +353,8 @@
 }
 
 static void printUsesPermission(const String8& name, bool optional=false, int maxSdkVersion=-1,
-        const String8& requiredFeature = String8::empty(),
-        const String8& requiredNotFeature = String8::empty()) {
+        const String8& requiredFeature = String8(),
+        const String8& requiredNotFeature = String8()) {
     printf("uses-permission: name='%s'", ResTable::normalizeForOutput(name.string()).string());
     if (maxSdkVersion != -1) {
          printf(" maxSdkVersion='%d'", maxSdkVersion);