Remove Earl Grey matcher APIs taking NSString.

ios/web/shell/test/earl_grey/shell_matchers.mm

Index: ios/web/shell/test/earl_grey/shell_matchers.mm
diff --git a/ios/web/shell/test/earl_grey/shell_matchers.mm b/ios/web/shell/test/earl_grey/shell_matchers.mm
index 7bd54671dce82f14d29e8210886323999e4e5323..6763f9ca8235ab10213d3d200ab2ff6769d579e2 100644
--- a/ios/web/shell/test/earl_grey/shell_matchers.mm
+++ b/ios/web/shell/test/earl_grey/shell_matchers.mm
@@ -15,16 +15,6 @@
 
 namespace web {
 
-id<GREYMatcher> webViewContainingText(NSString* text) {
-  return [GREYMatchers
-      matcherForWebViewContainingText:base::SysNSStringToUTF8(text)];
-}
-
-id<GREYMatcher> addressFieldText(NSString* text) {
-  return [GREYMatchers
-      matcherForAddressFieldEqualToText:base::SysNSStringToUTF8(text)];
-}
-
 id<GREYMatcher> webViewContainingText(const std::string& text) {
   return [GREYMatchers matcherForWebViewContainingText:text];
 }