Enable string pooling in the no_optimize configuration, under Windows.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 8115239fafa7f1f0791b0a2356164a32119ac289..6ed9f28c6bf4e85508c93c41ed45100c170062b4 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -1447,6 +1447,7 @@ config("no_optimize") {
     cflags = [
       "/Od",  # Disable optimization.
       "/Ob0",  # Disable all inlining (on by default).
+      "/GF",  # Enable string pooling (off by default).
     ]
   } else if (is_android && !android_full_debug) {
     # On Android we kind of optimize some things that don't affect debugging