Switch to standard integer types in chrome/browser/, part 3 of 4.

chrome/browser/prerender/prerender_histograms.cc

Index: chrome/browser/prerender/prerender_histograms.cc
diff --git a/chrome/browser/prerender/prerender_histograms.cc b/chrome/browser/prerender/prerender_histograms.cc
index 46a35ff9680ac2d76c7e2c91574ecd7f271f9cca..b7401d0a9dfb948579de7e529bd3b33be1e19ace 100644
--- a/chrome/browser/prerender/prerender_histograms.cc
+++ b/chrome/browser/prerender/prerender_histograms.cc
@@ -361,8 +361,8 @@ void PrerenderHistograms::RecordFinalStatus(
 
 void PrerenderHistograms::RecordNetworkBytes(Origin origin,
                                              bool used,
-                                             int64 prerender_bytes,
-                                             int64 profile_bytes) {
+                                             int64_t prerender_bytes,
+                                             int64_t profile_bytes) {
   const int kHistogramMin = 1;
   const int kHistogramMax = 100000000;  // 100M.
   const int kBucketCount = 50;