Clarify Beacon transmission limit checking.

third_party/WebKit/Source/core/loader/PingLoader.h

Index: third_party/WebKit/Source/core/loader/PingLoader.h
diff --git a/third_party/WebKit/Source/core/loader/PingLoader.h b/third_party/WebKit/Source/core/loader/PingLoader.h
index c2105a13f90ba0d5e700ad42ff3ed476f0f07196..dc47bf82d1dd89c4be0224d3f51754b261865ce0 100644
--- a/third_party/WebKit/Source/core/loader/PingLoader.h
+++ b/third_party/WebKit/Source/core/loader/PingLoader.h
@@ -78,14 +78,14 @@ class CORE_EXPORT PingLoader {
   // The last argument is guaranteed to be set to the size of payload if
   // these method return true. If these method returns false, the value
   // shouldn't be used.
-  static bool sendBeacon(LocalFrame*, int, const KURL&, const String&, int&);
+  static bool sendBeacon(LocalFrame*, int, const KURL&, const String&, size_t&);
   static bool sendBeacon(LocalFrame*,
                          int,
                          const KURL&,
                          DOMArrayBufferView*,
-                         int&);
-  static bool sendBeacon(LocalFrame*, int, const KURL&, Blob*, int&);
-  static bool sendBeacon(LocalFrame*, int, const KURL&, FormData*, int&);
+                         size_t&);
+  static bool sendBeacon(LocalFrame*, int, const KURL&, Blob*, size_t&);
+  static bool sendBeacon(LocalFrame*, int, const KURL&, FormData*, size_t&);
 };
 
 }  // namespace blink