Remove ANGLE code comments related to base::clamp

We are recently converting base::clamp to std::clamp, and the original
code comments related to base::clamp can be removed.

Bug: angleproject:8140, chromium:1231569, chromium:1373621
Change-Id: Iae5f9e816ef1c531d728a35079d6110d1a9dad2f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4469309
Auto-Submit: Ho Cheung <uioptt24@gmail.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

AUTHORS

@@ -78,3 +78,4 @@ Stephan Hartmann
 SeongHwan Park
 Xiaopeng Li
 Akihiko Odaki
+Ho Cheung

src/common/base/anglebase/numerics/ranges.h

@@ -11,12 +11,8 @@
 namespace base
 {
 
-// DO NOT USE THIS FUNCTION. IT IS DUE TO BE REMOVED. https://crbug.com/1231569
-// Please use base::clamp() from base/cxx17_backports.h instead.
-//
 // This function, unlike base::clamp(), does not check if `min` is greater than
-// `max`, and returns a bogus answer if it is. Please migrate all code that
-// calls this function to use base::clamp() instead.
+// `max`, and returns a bogus answer if it is.
 //
 // If, for some reason the broken behavior is required, please re-create this
 // min/max nesting inline in the host code and explain with a comment why it