AAPT2: Rename to match new style

Use Google3 naming style to match new
projects' and open source google projects' style.

Preferred to do this in a massive CL so as to avoid
style inconsistencies that plague legacy code bases.
This is a relatively NEW code base, may as well keep
it up to date.

Test: name/style refactor - existing tests pass
Change-Id: Ie80ecb78d46ec53efdfca2336bb57d96cbb7fb87
diff --git a/tools/aapt2/AppInfo.h b/tools/aapt2/AppInfo.h
index 2cbe117..1e488f7 100644
--- a/tools/aapt2/AppInfo.h
+++ b/tools/aapt2/AppInfo.h
@@ -17,10 +17,10 @@
 #ifndef AAPT_APP_INFO_H
 #define AAPT_APP_INFO_H
 
-#include "util/Maybe.h"
-
 #include <string>
 
+#include "util/Maybe.h"
+
 namespace aapt {
 
 /**
@@ -36,17 +36,17 @@
   /**
    * The App's minimum SDK version.
    */
-  Maybe<std::string> minSdkVersion;
+  Maybe<std::string> min_sdk_version;
 
   /**
    * The Version code of the app.
    */
-  Maybe<uint32_t> versionCode;
+  Maybe<uint32_t> version_code;
 
   /**
    * The revision code of the app.
    */
-  Maybe<uint32_t> revisionCode;
+  Maybe<uint32_t> revision_code;
 };
 
 }  // namespace aapt