transcoding: renaming to session controller to avoid confusion

No functional change.

bug:154733526

Change-Id: I8731a721ab3a6ae2937e1ac24e4f1a2f1e27da85
diff --git a/media/libmediatranscoding/transcoder/VideoTrackTranscoder.cpp b/media/libmediatranscoding/transcoder/VideoTrackTranscoder.cpp
index 0713eb8..23993ca 100644
--- a/media/libmediatranscoding/transcoder/VideoTrackTranscoder.cpp
+++ b/media/libmediatranscoding/transcoder/VideoTrackTranscoder.cpp
@@ -480,7 +480,7 @@
     androidSetThreadPriority(0 /* tid (0 = current) */, ANDROID_PRIORITY_VIDEO);
 
     // Push start decoder and encoder as two messages, so that these are subject to the
-    // stop request as well. If the job is cancelled (or paused) immediately after start,
+    // stop request as well. If the session is cancelled (or paused) immediately after start,
     // we don't need to waste time start then stop the codecs.
     mCodecMessageQueue.push([this] {
         media_status_t status = AMediaCodec_start(mDecoder);