Makes GetBuildTime behave identically on all build types.

build/config/posix/BUILD.gn

Index: build/config/posix/BUILD.gn
diff --git a/build/config/posix/BUILD.gn b/build/config/posix/BUILD.gn
index b2ccacebfd9767477c883bbe5c5ff2abb3dd8557..d0ccc5015719a6ad1505883555e24d6757509acc 100644
--- a/build/config/posix/BUILD.gn
+++ b/build/config/posix/BUILD.gn
@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/build_metadata.gni")
 import("//build/config/sysroot.gni")
 
 assert(is_posix)
@@ -14,14 +13,7 @@ assert(is_posix)
 config("runtime_library") {
   if (!is_mac && sysroot != "") {
     # Pass the sysroot to all C compiler variants, the assembler, and linker.
-    # If we don't care about build metadata, then just set the sysroot to an
-    # absolute path. Some buildbots (read: codesearch) care about this.
-    # See crbug.com/580103 for some discussion of why this was necessary.

[Nico, 2016/02/09 22:53:49]

...won't this change regress things?

[Zachary Forman, 2016/02/09 23:26:23]

No, because of a CL dsansome submitted a few days ago:
https://codereview.chromium.org/1658553002 (and its followups).

This CL can nuke dont_embed_build_metadata completely.

Edit: Wait, yes it will. I removed the wrong path. Corrected!

-    if (dont_embed_build_metadata) {
-      cflags = [ "--sysroot=" + rebase_path(sysroot, root_build_dir) ]
-    } else {
-      cflags = [ "--sysroot=" + rebase_path(sysroot) ]
-    }
+    cflags = [ "--sysroot=" + rebase_path(sysroot) ]
     asmflags = cflags
     ldflags = cflags