update_engine: fixed warnings from cpplint

Fixed all the cpplint warnings in update engine.

BUG=None
TEST=Unit tests still pass.

Change-Id: I285ae858eec8abe0b26ff203b99a42a200ceb71c
Reviewed-on: https://chromium-review.googlesource.com/204027
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/libcurl_http_fetcher.h b/libcurl_http_fetcher.h
index 6008183..d835b9c 100644
--- a/libcurl_http_fetcher.h
+++ b/libcurl_http_fetcher.h
@@ -7,6 +7,7 @@
 
 #include <map>
 #include <string>
+#include <utility>
 
 #include <base/basictypes.h>
 #include <base/logging.h>
@@ -214,7 +215,7 @@
   // the glib main loop. libcurl may open/close descriptors and switch their
   // directions so maintain two separate lists so that watch conditions can be
   // set appropriately.
-  typedef std::map<int, std::pair<GIOChannel*, guint> > IOChannels;
+  typedef std::map<int, std::pair<GIOChannel*, guint>> IOChannels;
   IOChannels io_channels_[2];
 
   // if non-NULL, a timer we're waiting on. glib main loop will call us back