Don't use Singleton to cache JNI method IDs in Java Bridge

base/android/jni_android.h

Index: base/android/jni_android.h
diff --git a/base/android/jni_android.h b/base/android/jni_android.h
index 462173f85d38cf48b62e466ebeb97e1b0a6ea006..9eda8309bcef7877a48a0a267789ddd4dd0de70e 100644
--- a/base/android/jni_android.h
+++ b/base/android/jni_android.h
@@ -30,19 +30,15 @@ void InitApplicationContext(jobject context);
 // Returns the application context assigned by InitApplicationContext().
 jobject GetApplicationContext();
 
-// Wraps a method ID.
-class MethodID {
- public:
-  jmethodID id() { return id_; }
- protected:
-  // Gets the method ID from the class name. Clears the pending Java exception
-  // and returns NULL if the method is not found. Note that GetMethodID() below
-  // avoids a class lookup, so should be used in preference when possible.
-  MethodID(JNIEnv* env, const char* class_name, const char* method,
-           const char* jni_signature);
- private:
-  jmethodID id_;
-};
+// Gets the method ID from the class name. class_name and method must be valid
+// Java identifiers and jni_signature must a valid JNI signature. Clears the
+// pending Java exception and returns NULL if the method is not found. Caches
+// results. Note that GetMethodID() below avoids a class lookup, but does not
+// cache results.
+jmethodID GetMethodIDFromClassName(JNIEnv* env,
+                                   const char* class_name,
+                                   const char* method,
+                                   const char* jni_signature);
 
 // Get the method ID for a method. Will clear the pending Java
 // exception and return 0 if the method is not found.