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..2590d17ffe948afc5971342868378a7dc2c31beb 100644
--- a/build/config/posix/BUILD.gn
+++ b/build/config/posix/BUILD.gn
@@ -14,14 +14,7 @@ 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.
-    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