Revert of Update SplitString calls to new form

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 47a448deb3739c3e64c4a476f885106f1e1db386..ace02a32afd8e55e70e7d774eb27afe6ae100a43 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -2476,11 +2476,11 @@
   if (headers.empty()) {
     params->set_prefer_cache(true);
   } else {
-    for (const base::StringPiece& key_value :
-         base::SplitStringPiece(
-             headers, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
-      std::vector<std::string> pair = base::SplitString(
-          key_value, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+    std::vector<std::string> key_value_list;
+    base::SplitString(headers, '\n', &key_value_list);
+    for (const auto& key_value : key_value_list) {
+      std::vector<std::string> pair;
+      base::SplitString(key_value, ':', &pair);
       DCHECK_EQ(2ul, pair.size());
       params->add_request_header(pair[0], pair[1]);
     }