Fix -Wc++11-narrowing: base/

Bug: 1216696
Change-Id: I24034af2489b1cb5336fdc95a13440011b03ebbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2975059
Auto-Submit: Peter Kasting <[email protected]>
Commit-Queue: François Doray <[email protected]>
Reviewed-by: François Doray <[email protected]>
Cr-Commit-Position: refs/heads/master@{#894233}
diff --git a/base/strings/sys_string_conversions_mac_unittest.mm b/base/strings/sys_string_conversions_mac_unittest.mm
index 670cb9b1..0ffbf59 100644
--- a/base/strings/sys_string_conversions_mac_unittest.mm
+++ b/base/strings/sys_string_conversions_mac_unittest.mm
@@ -22,16 +22,16 @@
 
 std::vector<std::string> GetRoundTripStrings() {
   return {
-      "Hello, World!",    // ASCII / ISO8859 string (also valid UTF-8)
-      {'a', 0, 'b'},      // UTF-8 with embedded NUL byte
-      {0xce, 0xbb, 'f'},  // lowercase lambda + 'f'
-      "χρώμιο",           // "chromium" in greek
-      "כרום",             // "chromium" in hebrew
-      "クロム",           // "chromium" in japanese
+      "Hello, World!",  // ASCII / ISO8859 string (also valid UTF-8)
+      "a\0b",           // UTF-8 with embedded NUL byte
+      "λf",             // lowercase lambda + 'f'
+      "χρώμιο",         // "chromium" in greek
+      "כרום",           // "chromium" in hebrew
+      "クロム",         // "chromium" in japanese
 
       // Tarot card symbol "the morning", which does not fit in one UTF-16
       // character.
-      u8"\U0001f0e6",
+      "🃦",
   };
 }