content/browser: Move speech code into content namespace.

content/browser/speech/audio_buffer.cc

Index: content/browser/speech/audio_buffer.cc
diff --git a/content/browser/speech/audio_buffer.cc b/content/browser/speech/audio_buffer.cc
index ef49004e1e3c61f3f926c26ac35bdf4f12b46dea..3e7d2a4a68e6cd83de940abe57d7d0f57f040eeb 100644
--- a/content/browser/speech/audio_buffer.cc
+++ b/content/browser/speech/audio_buffer.cc
@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/browser/speech/audio_buffer.h"
+
 #include "base/logging.h"
 #include "base/stl_util.h"
-#include "content/browser/speech/audio_buffer.h"
 
-namespace speech {
+namespace content {
 
 AudioChunk::AudioChunk(int bytes_per_sample)
     : bytes_per_sample_(bytes_per_sample) {
@@ -87,4 +88,4 @@ bool AudioBuffer::IsEmpty() const {
   return chunks_.empty();
 }
 
-}  // namespace speech
+}  // namespace content