Reland of land "Turn libbase into a component"

src/startup-data-util.cc

Index: src/startup-data-util.cc
diff --git a/src/startup-data-util.cc b/src/startup-data-util.cc
index 7c6d9ebf216ffa556a0a1f2c36ff6469deb4a305..5f5472f0afcd111f1e59ce269e2649c5fe6f1beb 100644
--- a/src/startup-data-util.cc
+++ b/src/startup-data-util.cc
@@ -86,8 +86,9 @@
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   char* natives;
   char* snapshot;
-  LoadFromFiles(RelativePath(&natives, directory_path, "natives_blob.bin"),
-                RelativePath(&snapshot, directory_path, "snapshot_blob.bin"));
+  LoadFromFiles(
+      base::RelativePath(&natives, directory_path, "natives_blob.bin"),
+      base::RelativePath(&snapshot, directory_path, "snapshot_blob.bin"));
   free(natives);
   free(snapshot);
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA