Replaced deprecated v8 API calls by their non-deprecated counterparts.

net/proxy/proxy_resolver_v8.h

Index: net/proxy/proxy_resolver_v8.h
diff --git a/net/proxy/proxy_resolver_v8.h b/net/proxy/proxy_resolver_v8.h
index 3adc672a1ffebdb9db891e255f06fd25c704406a..4b5760b41f2c011ce59daf93a29757f84158adca 100644
--- a/net/proxy/proxy_resolver_v8.h
+++ b/net/proxy/proxy_resolver_v8.h
@@ -11,6 +11,7 @@
 #include "net/proxy/proxy_resolver.h"
 
 namespace v8 {
+class HeapStatistics;
 class Isolate;
 }  // namespace v8
 
@@ -95,6 +96,11 @@ class NET_EXPORT_PRIVATE ProxyResolverV8 : public ProxyResolver {
   static void RememberDefaultIsolate();
   static v8::Isolate* GetDefaultIsolate();
 
+  // Get total/ued heap memory usage of all v8 instances used by the proxy
+  // resolver.
+  static size_t GetTotalHeapSize();
+  static size_t GetUsedHeapSize();
+
  private:
   static v8::Isolate* g_default_isolate_;