Remove top-level const from parameters in function declarations.

This is a safe cleanup change since top-level const applied to
parameters in function declarations (that are not also
definitions) are ignored by the compiler. Hence, such changes do
not change the type of the declared functions and are simply
no-ops.

Bug: webrtc:13610
Change-Id: Ibafb92c45119a6d8bdb6f9109aa8dad6385163a9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249086
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Ali Tofigh <alito@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35802}
diff --git a/rtc_base/string_utils.h b/rtc_base/string_utils.h
index d844e5e..6e8b0b5 100644
--- a/rtc_base/string_utils.h
+++ b/rtc_base/string_utils.h
@@ -86,7 +86,7 @@
 std::string string_trim(const std::string& s);
 
 // TODO(jonasolsson): replace with absl::Hex when that becomes available.
-std::string ToHex(const int i);
+std::string ToHex(int i);
 
 // CompileTimeString comprises of a string-like object which can be used as a
 // regular const char* in compile time and supports concatenation. Useful for