Add more string_util functions to base namespace.

android_webview/renderer/aw_content_renderer_client.cc

Index: android_webview/renderer/aw_content_renderer_client.cc
diff --git a/android_webview/renderer/aw_content_renderer_client.cc b/android_webview/renderer/aw_content_renderer_client.cc
index 548d3ecb1b05fcbff5a633e28d748a3461612ec5..ea4b0bd3b628757f69886d3a78e4e2945b9b603f 100644
--- a/android_webview/renderer/aw_content_renderer_client.cc
+++ b/android_webview/renderer/aw_content_renderer_client.cc
@@ -174,10 +174,10 @@ void AwContentRendererClient::GetNavigationErrorStrings(
       contents = AwResource::GetNoDomainPageContent();
     } else {
       contents = AwResource::GetLoadErrorPageContent();
-      ReplaceSubstringsAfterOffset(&contents, 0, "%e", err);
+      base::ReplaceSubstringsAfterOffset(&contents, 0, "%e", err);
     }
 
-    ReplaceSubstringsAfterOffset(&contents, 0, "%s",
+    base::ReplaceSubstringsAfterOffset(&contents, 0, "%s",
         net::EscapeForHTML(error_url.possibly_invalid_spec()));
     *error_html = contents;
   }