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/multi_range_http_fetcher.cc b/multi_range_http_fetcher.cc
index 9eeefcd..19263de 100644
--- a/multi_range_http_fetcher.cc
+++ b/multi_range_http_fetcher.cc
@@ -4,6 +4,9 @@
 
 #include <base/strings/stringprintf.h>
 
+#include <algorithm>
+#include <string>
+
 #include "update_engine/multi_range_http_fetcher.h"
 #include "update_engine/utils.h"
 
@@ -41,7 +44,7 @@
     return;
   }
   terminating_ = true;
-    
+
   if (!pending_transfer_ended_) {
     base_fetcher_->TerminateTransfer();
   }