[Android] Add a java.lang.System wrapper.

net/proxy/proxy_config_service_android.cc

Index: net/proxy/proxy_config_service_android.cc
diff --git a/net/proxy/proxy_config_service_android.cc b/net/proxy/proxy_config_service_android.cc
index 66065fb1c665ebb3c006108cd13bc3c7913b2e73..e47670d09a79d09e17b6db8f74888696e091030c 100644
--- a/net/proxy/proxy_config_service_android.cc
+++ b/net/proxy/proxy_config_service_android.cc
@@ -4,8 +4,7 @@
 
 #include "net/proxy/proxy_config_service_android.h"
 
-#include <sys/system_properties.h>
-
+#include "base/android/java_system.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/basictypes.h"
@@ -156,14 +155,8 @@ void GetLatestProxyConfigInternal(const GetPropertyCallback& get_property,
 }
 
 std::string GetJavaProperty(const std::string& property) {
-  // Use Java System.getProperty to get configuration information.
   // TODO(pliard): Conversion to/from UTF8 ok here?
-  JNIEnv* env = AttachCurrentThread();
-  ScopedJavaLocalRef<jstring> str = ConvertUTF8ToJavaString(env, property);
-  ScopedJavaLocalRef<jstring> result =
-      Java_ProxyChangeListener_getProperty(env, str.obj());
-  return result.is_null() ?
-      std::string() : ConvertJavaStringToUTF8(env, result.obj());
+  return base::android::JavaSystem::GetProperty(property);
 }
 
 void CreateStaticProxyConfig(const std::string& host,