[Android WebView] Remove unnecessary DCHECK in InputStreamImpl.

android_webview/native/input_stream_impl.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 "android_webview/native/input_stream_impl.h"
 
 #include "base/android/jni_android.h"
 // Disable "Warnings treated as errors" for input_stream_jni as it's a Java
 // system class and we have to generate C++ hooks for all methods in the class
 // even if they're unused.
@@ skipping 19 matching lines @@
 
 // Maximum number of bytes to be read in a single read.
 const int InputStreamImpl::kBufferSize = 4096;
 
 //static
 const InputStreamImpl* InputStreamImpl::FromInputStream(
         const InputStream* input_stream) {
     return static_cast<const InputStreamImpl*>(input_stream);
 }
 
+// TODO: Use unsafe version for all Java_InputStream methods in this file
+// once BUG 157880 is fixed and implement graceful exception handling.
+
 InputStreamImpl::InputStreamImpl() {
 }
 
 InputStreamImpl::InputStreamImpl(const JavaRef<jobject>& stream)
     : jobject_(stream) {
   DCHECK(!stream.is_null());
 }
 
 InputStreamImpl::~InputStreamImpl() {
   JNIEnv* env = AttachCurrentThread();
   Java_InputStream_close(env, jobject_.obj());
-  DCHECK(!ClearException(env));
 }
 
 bool InputStreamImpl::BytesAvailable(int* bytes_available) const {
   JNIEnv* env = AttachCurrentThread();
-  // TODO: Use unsafe version for all Java_InputStream methods in this file
-  // once BUG 157880 is fixed.
   int bytes = Java_InputStream_available(env, jobject_.obj());
   if (ClearException(env))
     return false;
   *bytes_available = bytes;
   return true;
 }
 
 bool InputStreamImpl::Skip(int64_t n, int64_t* bytes_skipped) {
   JNIEnv* env = AttachCurrentThread();
   int bytes = Java_InputStream_skip(env, jobject_.obj(), n);
@@ skipping 51 matching lines @@
   env->GetByteArrayRegion(buffer, 0, byte_count,
       reinterpret_cast<jbyte*>(dest->data() + *bytes_read));
   if (ClearException(env))
     return false;
 
   *bytes_read = byte_count;
   return true;
 }
 
 } // namespace android_webview