Replace ASSERT with DCHECK in WebAudio

third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.cpp

Index: third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.cpp b/third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.cpp
index ecdecdbc15be26daa6a123ea6b339d1358b5f79b..453d8b2145886f0cdc637247caf7a38f929cf5ba 100644
--- a/third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.cpp
@@ -66,12 +66,12 @@ void ChannelMergerHandler::process(size_t framesToProcess)
     ASSERT_UNUSED(framesToProcess, framesToProcess == output.bus()->length());
 
     unsigned numberOfOutputChannels = output.numberOfChannels();
-    ASSERT(numberOfInputs() == numberOfOutputChannels);
+    DCHECK(numberOfInputs() == numberOfOutputChannels);
 
     // Merge multiple inputs into one output.
     for (unsigned i = 0; i < numberOfOutputChannels; ++i) {
         AudioNodeInput& input = this->input(i);
-        ASSERT(input.numberOfChannels() == 1);
+        DCHECK_EQ(static_cast<int>(input.numberOfChannels()), 1);
         AudioChannel* outputChannel = output.bus()->channel(i);
         if (input.isConnected()) {
 
@@ -93,7 +93,7 @@ void ChannelMergerHandler::process(size_t framesToProcess)
 
 void ChannelMergerHandler::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
 {
-    ASSERT(isMainThread());
+    DCHECK(isMainThread());
     AbstractAudioContext::AutoLocker locker(context());
 
     // channelCount must be 1.
@@ -106,7 +106,7 @@ void ChannelMergerHandler::setChannelCount(unsigned long channelCount, Exception
 
 void ChannelMergerHandler::setChannelCountMode(const String& mode, ExceptionState& exceptionState)
 {
-    ASSERT(isMainThread());
+    DCHECK(isMainThread());
     AbstractAudioContext::AutoLocker locker(context());
 
     // channcelCountMode must be 'explicit'.