Remove unnecassary parameter "sampleRate" for loadAudioResource().

content/renderer/media/audio_decoder.cc

Index: content/renderer/media/audio_decoder.cc
diff --git a/content/renderer/media/audio_decoder.cc b/content/renderer/media/audio_decoder.cc
index e853c24160b00d0a8fc3fe07def3284cfd651e7a..c413bb08020ae0fc9ff3f940fabc306dfe77bc79 100644
--- a/content/renderer/media/audio_decoder.cc
+++ b/content/renderer/media/audio_decoder.cc
@@ -26,7 +26,7 @@ namespace content {
 // Decode in-memory audio file data.
 bool DecodeAudioFileData(
     blink::WebAudioBus* destination_bus,
-    const char* data, size_t data_size, double sample_rate) {
+    const char* data, size_t data_size) {
   DCHECK(destination_bus);
   if (!destination_bus)
     return false;