update_engine: Update to build against libchrome-271506.

BUG=chromium:375032
TEST=`FEATURES=test emerge-$BOARD update_engine`

Change-Id: Ia7be302c12b439ad8aece51c9cbe128086626620
Reviewed-on: https://chromium-review.googlesource.com/201045
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/chrome_browser_proxy_resolver.cc b/chrome_browser_proxy_resolver.cc
index e0ab0df..94b9dae 100644
--- a/chrome_browser_proxy_resolver.cc
+++ b/chrome_browser_proxy_resolver.cc
@@ -227,7 +227,7 @@
   StringTokenizer entry_tok(input, ";");
   while (entry_tok.GetNext()) {
     string token = entry_tok.token();
-    TrimWhitespaceASCII(token, TRIM_ALL, &token);
+    base::TrimWhitespaceASCII(token, base::TRIM_ALL, &token);
 
     // Start by finding the first space (if any).
     std::string::iterator space;
@@ -251,7 +251,7 @@
       continue;  // Invalid proxy scheme
 
     string host_and_port = string(space, token.end());
-    TrimWhitespaceASCII(host_and_port, TRIM_ALL, &host_and_port);
+    base::TrimWhitespaceASCII(host_and_port, base::TRIM_ALL, &host_and_port);
     if (scheme != "direct" && host_and_port.empty())
       continue;  // Must supply host/port when non-direct proxy used.
     ret.push_back(scheme + "://" + host_and_port);