Move build_config.h from chromium/base/build to chromium/base

Moved build_config.h to mimic the include path on ChromeOS and Brillo.
On those platform, this file is included as just "build/build_config.h"

Change-Id: Ia8a30299cc7f485b38eeeddef2e5210644b3d2a3
Reviewed-on: https://weave-review.googlesource.com/1811
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
diff --git a/third_party/chromium/base/bind_internal.h b/third_party/chromium/base/bind_internal.h
index 6d500a5..613f7a9 100644
--- a/third_party/chromium/base/bind_internal.h
+++ b/third_party/chromium/base/bind_internal.h
@@ -6,11 +6,11 @@
 #define BASE_BIND_INTERNAL_H_
 
 #include "base/bind_helpers.h"
-#include "base/build/build_config.h"
 #include "base/callback_internal.h"
 #include "base/memory/weak_ptr.h"
 #include "base/template_util.h"
 #include "base/tuple.h"
+#include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include "base/bind_internal_win.h"