Revert "Rename openDexFileNative to openDexFile."

https://android-review.googlesource.com/#/c/103383/ introduces
absolute paths so we need back the old method name

Bug: 16644204

This reverts commit 350b626eb1cfbaee7619e9453a4c018c07aed003.

Change-Id: I10f430a536bb1906a8452fea5846ec9e725e84bd
diff --git a/runtime/native/dalvik_system_DexFile.cc b/runtime/native/dalvik_system_DexFile.cc
index 0af2c22..4310400 100644
--- a/runtime/native/dalvik_system_DexFile.cc
+++ b/runtime/native/dalvik_system_DexFile.cc
@@ -97,7 +97,7 @@
   void operator=(const NullableScopedUtfChars&);
 };
 
-static jlong DexFile_openDexFile(JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName, jint) {
+static jlong DexFile_openDexFileNative(JNIEnv* env, jclass, jstring javaSourceName, jstring javaOutputName, jint) {
   ScopedUtfChars sourceName(env, javaSourceName);
   if (sourceName.c_str() == NULL) {
     return 0;
@@ -570,7 +570,7 @@
   NATIVE_METHOD(DexFile, getClassNameList, "(J)[Ljava/lang/String;"),
   NATIVE_METHOD(DexFile, isDexOptNeeded, "(Ljava/lang/String;)Z"),
   NATIVE_METHOD(DexFile, isDexOptNeededInternal, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Z)B"),
-  NATIVE_METHOD(DexFile, openDexFile, "(Ljava/lang/String;Ljava/lang/String;I)J"),
+  NATIVE_METHOD(DexFile, openDexFileNative, "(Ljava/lang/String;Ljava/lang/String;I)J"),
 };
 
 void register_dalvik_system_DexFile(JNIEnv* env) {