Delete a few unused constants

llvm/llvm-project#66576 makes std::string's ctor
constexpr if it's short enough to fit in the short-string optimization.

This allows the compiler to realize that these are unused. Deleting them
is necessary to be able to update libc++.

(Relying on std::string's ctor to be constexpr for storage isn't allowed
per standard, see discussion on the pull request above.)

Bug: none
Change-Id: I860e1c67a7c15342901814dafbab262672c0d45a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4935335
Reviewed-by: Hans Wennborg <[email protected]>
Auto-Submit: Nico Weber <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Owners-Override: Nico Weber <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1208958}


CrOS-Libchrome-Original-Commit: 879cb86187c04e9e941c03174765e5030a5a9cba

Author: nico

base/command_line_unittest.cc

@@ -34,12 +34,15 @@
 
 namespace base {
 
+#if BUILDFLAG(IS_WIN)
 // To test Windows quoting behavior, we use a string that has some backslashes
 // and quotes.
 // Consider the command-line argument: q\"bs1\bs2\\bs3q\\\"
 // Here it is with C-style escapes.
 static const CommandLine::StringType kTrickyQuoted =
     FILE_PATH_LITERAL("q\\\"bs1\\bs2\\\\bs3q\\\\\\\"");
+#endif
+
 // It should be parsed by Windows as: q"bs1\bs2\\bs3q\"
 // Here that is with C-style escapes.
 static const CommandLine::StringType kTricky =