Fix cpplint issues

Existing cpplint issues block uploading CLs, fix most of them.

Test: m checkbuild
Change-Id: I3477d388659c93c1ca517c4ad37502e0a71014ad
diff --git a/payload_generator/extent_utils.h b/payload_generator/extent_utils.h
index 712cc92..bd9fc8b 100644
--- a/payload_generator/extent_utils.h
+++ b/payload_generator/extent_utils.h
@@ -17,6 +17,7 @@
 #ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_
 #define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_
 
+#include <limits>
 #include <string>
 #include <vector>