Remove legacy StartsWithASCII function.

components/translate/core/language_detection/language_detection_util.cc

Index: components/translate/core/language_detection/language_detection_util.cc
diff --git a/components/translate/core/language_detection/language_detection_util.cc b/components/translate/core/language_detection/language_detection_util.cc
index 144071422ce254bed984b521a896dd2123a0ebc8..fe2befed54378157bbf16c5fa383023463ce70fe 100644
--- a/components/translate/core/language_detection/language_detection_util.cc
+++ b/components/translate/core/language_detection/language_detection_util.cc
@@ -198,7 +198,8 @@ bool CanCLDComplementSubCode(
   // which dialect is used, CLD language has priority.
   // TODO(hajimehoshi): How about the other dialects like zh-MO?
   return page_language == "zh" &&
-         base::StartsWithASCII(cld_language, "zh-", false);
+         base::StartsWith(cld_language, "zh-",
+                          base::CompareCase::INSENSITIVE_ASCII);
 }
 
 }  // namespace
@@ -381,7 +382,8 @@ bool IsSameOrSimilarLanguages(const std::string& page_language,
 bool MaybeServerWrongConfiguration(const std::string& page_language,
                                    const std::string& cld_language) {
   // If |page_language| is not "en-*", respect it and just return false here.
-  if (!base::StartsWithASCII(page_language, "en", false))
+  if (!base::StartsWith(page_language, "en",
+                        base::CompareCase::INSENSITIVE_ASCII))
     return false;
 
   // A server provides a language meta information representing "en-*". But it