Pull the new r369476 of base library from Chromium

The merge was done against r369476 which corresponds to git commit
0471d0e2e2ef4a544a63481a389e1df33ea7c00a of Jan 14, 2016

Change-Id: Ie6894cf65424cc5ad115110faccd51602b2d1234
Reviewed-on: https://weave-review.googlesource.com/2225
Reviewed-by: Alex Vakulenko <avakulenko@google.com>
diff --git a/src/backoff_entry.h b/src/backoff_entry.h
index 002fb8d..422ffc7 100644
--- a/src/backoff_entry.h
+++ b/src/backoff_entry.h
@@ -38,11 +38,11 @@
 
     // Maximum amount of time we are willing to delay our request, -1
     // for no maximum.
-    int64 maximum_backoff_ms;
+    int64_t maximum_backoff_ms;
 
     // Time to keep an entry from being discarded even when it
     // has no significant state, -1 to never discard.
-    int64 entry_lifetime_ms;
+    int64_t entry_lifetime_ms;
 
     // If true, we always use a delay of initial_delay_ms, even before
     // we've seen num_errors_to_ignore errors.  Otherwise, initial_delay_ms