Move file paging into ScreenRecoveryUI.

This fixes the N9 performance problem.

Change-Id: I00c10d4162ff266a6243285e5a5e768217f6f799
diff --git a/verifier_test.cpp b/verifier_test.cpp
index 93a071e..82546ed 100644
--- a/verifier_test.cpp
+++ b/verifier_test.cpp
@@ -124,6 +124,8 @@
 // nothing but print.
 class FakeUI : public RecoveryUI {
     void Init() { }
+    void SetStage(int, int) { }
+    void SetLocale(const char*) { }
     void SetBackground(Icon icon) { }
 
     void SetProgressType(ProgressType determinate) { }
@@ -139,6 +141,7 @@
         vfprintf(stderr, fmt, ap);
         va_end(ap);
     }
+    void ShowFile(const char*) { }
 
     void StartMenu(const char* const * headers, const char* const * items,
                            int initial_selection) { }