media: Replace wtf/Assertions.h macros in favor of base/logging.h macros

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

Index: third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp b/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
index 10318c7860b6baf80e42ad22e30adee42e978948..1b06696c375a015c7aa437719fa4eeb03cf79c3c 100644
--- a/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp
@@ -73,7 +73,7 @@ void MediaElementAudioSourceHandler::setFormat(size_t numberOfChannels, float so
     if (numberOfChannels != m_sourceNumberOfChannels || sourceSampleRate != m_sourceSampleRate) {
         if (!numberOfChannels || numberOfChannels > AbstractAudioContext::maxNumberOfChannels() || !AudioUtilities::isValidAudioBufferSampleRate(sourceSampleRate)) {
             // process() will generate silence for these uninitialized values.
-            WTF_LOG(Media, "MediaElementAudioSourceNode::setFormat(%u, %f) - unhandled format change", static_cast<unsigned>(numberOfChannels), sourceSampleRate);
+            DVLOG(3) << "setFormat(" << numberOfChannels << ", " << sourceSampleRate << ") - unhandled format change";

[Raymond Toy, 2016/05/19 14:48:42]

How did you decide on 3?

Doesn't WTF_LOG always produce an output?  DVLOG(3) will only produce an output
if user has set up debugging logging at level 3, right?  If this is so, don't we
want to preserve WTF_LOG behavior?

[Srirama, 2016/05/19 14:54:44]

We are using 3 in core/html media files, to make it less verbose
9https://codereview.chromium.org/1988753002/). So i just followed same here.
Probably we can use 1 here as there are less logs compared to core/html?

[Raymond Toy, 2016/05/19 15:31:37]

I see.

I think these are fairly rare.  Can we just make it always output a message? 
When the condition fails and there's no message, it's really hard to figure out
why there's no audio anymore.

[Srirama, 2016/05/20 07:33:39]

Even WTF_LOG will print only in debug mode and if user enables it through
-blink-platform-log-channels=Media command line switch. Anyway i found DLOG
which will print always in Debug mode. I think that should solve our purpose. So
is it fine?

             // Synchronize with process().
             Locker<MediaElementAudioSourceHandler> locker(*this);
             m_sourceNumberOfChannels = 0;