Revert "Some cleanups to recovery."

This reverts commit c0319b60f56d445c2d1c74f551e01f069b028fe6.

Reason for revert: Broke builds.

Change-Id: I82aa880b83de5ae6c36fd7567cb001920559a972
diff --git a/install.cpp b/install.cpp
index 3871271..0f9088a 100644
--- a/install.cpp
+++ b/install.cpp
@@ -43,6 +43,8 @@
 #include "ui.h"
 #include "verifier.h"
 
+extern RecoveryUI* ui;
+
 #define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"
 #define PUBLIC_KEYS_FILE "/res/keys"
 static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";