Revert 196271 "CHECK for adding duplicate converter inputs."

media/base/audio_converter.cc

Index: media/base/audio_converter.cc
diff --git a/media/base/audio_converter.cc b/media/base/audio_converter.cc
index ac82e314ba32d50845cf2c8404a483c4cf398caf..d0c45136dada58fe83069e20d4f8c389b970098f 100644
--- a/media/base/audio_converter.cc
+++ b/media/base/audio_converter.cc
@@ -98,10 +98,8 @@ AudioConverter::AudioConverter(const AudioParameters& input_params,
 AudioConverter::~AudioConverter() {}
 
 void AudioConverter::AddInput(InputCallback* input) {
-  // TODO(dalecurtis): Speculative CHECK for http://crbug.com/233026, should be
-  // converted to a DCHECK once resolved.
-  CHECK(std::find(transform_inputs_.begin(), transform_inputs_.end(), input) ==
-        transform_inputs_.end());
+  DCHECK(std::find(transform_inputs_.begin(), transform_inputs_.end(), input) ==
+         transform_inputs_.end());
   transform_inputs_.push_back(input);
 }