Document the 'int' return value of Resampler methods.

Remove an obsolete TODO comment.

R=andrew@webrtc.org
BUG=none

Review URL: https://webrtc-codereview.appspot.com/48589004

Cr-Commit-Position: refs/heads/master@{#8814}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8814 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/common_audio/resampler/include/resampler.h

@@ -61,12 +61,12 @@ enum ResamplerMode
     kResamplerMode11To8
 };
 
+// All methods return 0 on success and -1 on failure.
 class Resampler
 {
 
 public:
     Resampler();
-    // TODO(andrew): use an init function instead.
     Resampler(int inFreq, int outFreq, ResamplerType type);
     ~Resampler();