Reverts fdca07 and makes it possible to force absolute paths.

build/config/BUILD.gn

Index: build/config/BUILD.gn
diff --git a/build/config/BUILD.gn b/build/config/BUILD.gn
index 9a3a6b7452a50f09e826f4eba07f96d59115ffde..b9208ac302ea8e4e7f764b120dbbb0a69476513f 100644
--- a/build/config/BUILD.gn
+++ b/build/config/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/config/allocator.gni")
+import("//build/config/build_metadata.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
@@ -23,17 +24,6 @@ declare_args() {
   # significantly slow execution.
   enable_iterator_debugging = true
 
-  # Set to true to not store any build metadata, e.g. ifdef out all __DATE__
-  # and __TIME__. Set to 0 to reenable the use of these macros in the code
-  # base. See http://crbug.com/314403.
-  #
-  # Continue to embed build meta data in Official builds, basically the
-  # time it was built.
-  # TODO(maruel): This decision should be revisited because having an
-  # official deterministic build has high value too but MSVC toolset can't
-  # generate anything deterministic with WPO enabled AFAIK.
-  dont_embed_build_metadata = !is_official_build
-
   # Set to true to enable dcheck in Release builds.
   dcheck_always_on = false
 }