content/browser: Move speech code into content namespace.

content/browser/speech/audio_encoder.h

Index: content/browser/speech/audio_encoder.h
diff --git a/content/browser/speech/audio_encoder.h b/content/browser/speech/audio_encoder.h
index 43bfa1fedc102ac0cc150b9e9aba9c0e9d6d49bd..581eafd2af53f5a385c7145ed44c75c1cd2d9e32 100644
--- a/content/browser/speech/audio_encoder.h
+++ b/content/browser/speech/audio_encoder.h
@@ -12,8 +12,9 @@
 #include "base/memory/ref_counted.h"
 #include "content/browser/speech/audio_buffer.h"
 
-namespace speech {
+namespace content{
 class AudioChunk;
+
 // Provides a simple interface to encode raw audio using the various speech
 // codecs.
 class AudioEncoder {
@@ -54,6 +55,6 @@ class AudioEncoder {
   DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
 };
 
-}  // namespace speech
+}  // namespace content
 
 #endif  // CONTENT_BROWSER_SPEECH_AUDIO_ENCODER_H_