Export of internal Abseil changes.

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f4bb8afa9376b4120f56f3beff7b07260da4a5c2 by CJ Johnson <johnsoncj@google.com>:

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PiperOrigin-RevId: 209630262
GitOrigin-RevId: f4bb8afa9376b4120f56f3beff7b07260da4a5c2
Change-Id: I3fedf35011d805ee4a20b92e073b43523b47d15b

absl/strings/string_view_test.cc

@@ -284,7 +284,7 @@ TEST(StringViewTest, ComparisonOperatorsByCharacterPosition) {
 }
 #undef COMPARE
 
-// Sadly, our users often confuse std::string::npos with absl::string_view::npos;
+// Sadly, our users often confuse string::npos with absl::string_view::npos;
 // So much so that we test here that they are the same.  They need to
 // both be unsigned, and both be the maximum-valued integer of their type.
 
@@ -812,7 +812,7 @@ TEST(StringViewTest, FrontBackSingleChar) {
 }
 
 // `std::string_view::string_view(const char*)` calls
-// `std::char_traits<char>::length(const char*)` to get the std::string length. In
+// `std::char_traits<char>::length(const char*)` to get the string length. In
 // libc++, it doesn't allow `nullptr` in the constexpr context, with the error
 // "read of dereferenced null pointer is not allowed in a constant expression".
 // At run time, the behavior of `std::char_traits::length()` on `nullptr` is