Switch to standard integer types in content/.

BUG=138542
[email protected]

Review URL: https://codereview.chromium.org/1544273002

Cr-Commit-Position: refs/heads/master@{#366875}
diff --git a/content/browser/appcache/appcache_response_unittest.cc b/content/browser/appcache/appcache_response_unittest.cc
index cdce8e6..54f3a6e 100644
--- a/content/browser/appcache/appcache_response_unittest.cc
+++ b/content/browser/appcache/appcache_response_unittest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include <stdint.h>
+#include <string.h>
 
 #include <stack>
 #include <string>