Reland of land "Turn libbase into a component"

src/icu_util.cc

Index: src/icu_util.cc
diff --git a/src/icu_util.cc b/src/icu_util.cc
index bf59fd0aec5629bac0787e4ea768279828921643..4b511d96f357a3820613444e177295783eb04be6 100644
--- a/src/icu_util.cc
+++ b/src/icu_util.cc
@@ -52,9 +52,9 @@
   }
   char* icu_data_file_default;
 #if defined(V8_TARGET_LITTLE_ENDIAN)
-  RelativePath(&icu_data_file_default, exec_path, "icudtl.dat");
+  base::RelativePath(&icu_data_file_default, exec_path, "icudtl.dat");
 #elif defined(V8_TARGET_BIG_ENDIAN)
-  RelativePath(&icu_data_file_default, exec_path, "icudtb.dat");
+  base::RelativePath(&icu_data_file_default, exec_path, "icudtb.dat");
 #else
 #error Unknown byte ordering
 #endif