Revert of [builtins] Also migrate String.prototype.toLowerCase/toUpperCase to C++.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index bdf379b7d709885e04dd1b4bfdd58ac1e58e04d8..096ee63b2e5243605a7b1d42405d79cf16874279 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1340,17 +1340,6 @@
                           1, true);
     SimpleInstallFunction(prototype, "charCodeAt",
                           Builtins::kStringPrototypeCharCodeAt, 1, true);
-    // TODO(bmeurer): One day we will want to install the correct i18n functions
-    // here directly instead of first installing the dummy, and overriding those
-    // in i18n.js later.
-    SimpleInstallFunction(prototype, "toLocaleLowerCase",
-                          Builtins::kStringPrototypeToLowerCase, 0, false);
-    SimpleInstallFunction(prototype, "toLocaleUpperCase",
-                          Builtins::kStringPrototypeToUpperCase, 0, false);
-    SimpleInstallFunction(prototype, "toLowerCase",
-                          Builtins::kStringPrototypeToLowerCase, 0, false);
-    SimpleInstallFunction(prototype, "toUpperCase",
-                          Builtins::kStringPrototypeToUpperCase, 0, false);
     SimpleInstallFunction(prototype, "trim", Builtins::kStringPrototypeTrim, 0,
                           false);
     SimpleInstallFunction(prototype, "trimLeft",