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.cc b/src/backoff_entry.cc
index 6b99d79..7efc33b 100644
--- a/src/backoff_entry.cc
+++ b/src/backoff_entry.cc
@@ -74,7 +74,7 @@
 
   base::TimeTicks now = ImplGetTimeNow();
 
-  int64 unused_since_ms =
+  int64_t unused_since_ms =
       (now - exponential_backoff_release_time_).InMilliseconds();
 
   // Release time is further than now, we are managing it.
@@ -152,7 +152,7 @@
 
   // Decide between maximum release time and calculated release time, accounting
   // for overflow with both.
-  int64 release_time_us =
+  int64_t release_time_us =
       std::min(calculated_release_time_us.ValueOrDefault(kMaxTime),
                maximum_release_time_us.ValueOrDefault(kMaxTime));