Revert "Implement tracking of BUILD.gn files ..."

This change reverts reverts commit 44fd682d (#483337);
it looks like it doesn't correctly handle at least
changes to the default configs.

[email protected], [email protected], [email protected]
BUG=755622

Change-Id: Ic8ad61736ad208bcce6004e8047febf405c001e1
Reviewed-on: https://chromium-review.googlesource.com/617774
Commit-Queue: Dirk Pranke <[email protected]>
Reviewed-by: Dirk Pranke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#495174}
diff --git a/tools/gn/config.cc b/tools/gn/config.cc
index 3f0912e..fcc5fa6 100644
--- a/tools/gn/config.cc
+++ b/tools/gn/config.cc
@@ -8,10 +8,8 @@
 #include "tools/gn/input_file_manager.h"
 #include "tools/gn/scheduler.h"
 
-Config::Config(const Settings* settings,
-               const Label& label,
-               const InputFileSet& input_files)
-    : Item(settings, label, input_files), resolved_(false) {}
+Config::Config(const Settings* settings, const Label& label)
+    : Item(settings, label), resolved_(false) {}
 
 Config::~Config() {
 }