Rename source_prereqs to inputs in the GN build.

build/secondary/chrome/BUILD.gn

Index: build/secondary/chrome/BUILD.gn
diff --git a/build/secondary/chrome/BUILD.gn b/build/secondary/chrome/BUILD.gn
index cbea517f5690f25e361e557d08f789f74cb6bb2e..4fdd5aa4ee0ce4c751821a7cfa2181f31c744649 100644
--- a/build/secondary/chrome/BUILD.gn
+++ b/build/secondary/chrome/BUILD.gn
@@ -199,7 +199,7 @@ action("about_credits") {
   # is added or removed, it will change the result, but there is no way to
   # express this as a build dependency. We approximate this by depending on
   # the last change file to force an update whenever the code is updated.
-  source_prereqs = [ "//build/util/LASTCHANGE" ]
+  inputs = [ "//build/util/LASTCHANGE" ]
 
   args = [ "credits", build_relative_about_credits_file ]
 }