Android JNI gen: Don't emit code for empty RegisterNatives()

android_webview/native/input_stream_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 
 #include "android_webview/native/input_stream_impl.h"
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "jni/InputStreamUnittest_jni.h"
@@ skipping 20 matching lines @@
 using testing::_;
 
 class InputStreamTest : public Test {
  public:
   InputStreamTest() {
   }
  protected:
   void SetUp() override {
     env_ = AttachCurrentThread();
     ASSERT_THAT(env_, NotNull());
-    ASSERT_TRUE(RegisterNativesImpl(env_));
   }
 
   scoped_refptr<IOBuffer> DoReadCountedStreamTest(int stream_size,
                                                   int bytes_requested,
                                                   int* bytes_read) {
     ScopedJavaLocalRef<jobject> counting_jstream =
         Java_InputStreamUnittest_getCountingStream(env_, stream_size);
     EXPECT_FALSE(counting_jstream.is_null());
 
     std::unique_ptr<InputStream> input_stream(
@@ skipping 83 matching lines @@
 
   const int bytes_requested = 10;
   int bytes_read = 0;
   scoped_refptr<IOBuffer> buffer = new IOBuffer(bytes_requested);
   EXPECT_FALSE(input_stream->Read(buffer.get(), bytes_requested, &bytes_read));
   EXPECT_EQ(0, bytes_read);
 
   // This closes the stream.
   input_stream.reset(NULL);
 }