Revert "update_engine: Update libchrome APIS to r456626."

This reverts commit 663ff4b30b9f629a130ef6d357d462b897d4071e.

Reason for revert: Broke the mac_sdk
Exempt-From-Owner-Approval: Fixing mac_sdk

Change-Id: I8184ec58e74d62dca0deafb39340d4bd36bf40e0
diff --git a/test_http_server.cc b/test_http_server.cc
index 6b2413f..2955e79 100644
--- a/test_http_server.cc
+++ b/test_http_server.cc
@@ -98,9 +98,9 @@
   request->raw_headers = headers;
 
   // Break header into lines.
-  vector<string> lines = base::SplitStringUsingSubstr(
-      headers.substr(0, headers.length() - strlen(EOL EOL)), EOL,
-      base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+  vector<string> lines;
+  base::SplitStringUsingSubstr(
+      headers.substr(0, headers.length() - strlen(EOL EOL)), EOL, &lines);
 
   // Decode URL line.
   vector<string> terms = base::SplitString(lines[0], base::kWhitespaceASCII,