Revert of Collecting encode_time_ms for each frame (patchset #13 id:220001 of https://codereview.webrtc.org/1374233002/ )

Reason for revert:
Breaks EndToEndTest.AssignsTransportSequenceNumbers in video_engine_tests
on several bots:
http://build.chromium.org/p/client.webrtc/builders/Linux64%20Debug/builds/5507
http://build.chromium.org/p/client.webrtc/builders/Mac64%20Debug/builds/4815
http://build.chromium.org/p/client.webrtc/builders/Win%20SyzyASan/builds/3272
http://build.chromium.org/p/client.webrtc/builders/Linux%20Memcheck/builds/4414

It seems very unfortunate that it breaks on _exactly_ the bot configs that aren't covered by the CQ trybots.

Original issue's description:
> Collecting encode_time_ms for each frame.
>
> Also, in Sample struct, replacing double with the original type.
> It makes more sense to save the original data as truthful as possible, and then
> convert it to double later if necessary (in the plot script).
>
> Committed: https://crrev.com/092b13384e57b33e2003d9736dfa1f491e76f938
> Cr-Commit-Position: refs/heads/master@{#10184}

TBR=sprang@webrtc.org,pbos@webrtc.org,mflodman@webrtc.org,asapersson@webrtc.org,ivica@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.webrtc.org/1383283005

Cr-Commit-Position: refs/heads/master@{#10185}
diff --git a/webrtc/video/full_stack_plot.py b/webrtc/video/full_stack_plot.py
index 4e09b41..0e89901 100755
--- a/webrtc/video/full_stack_plot.py
+++ b/webrtc/video/full_stack_plot.py
@@ -34,16 +34,15 @@
 
 # Fields
 DROPPED = 0
-INPUT_TIME = 1              # ms (timestamp)
-SEND_TIME = 2               # ms (timestamp)
-RECV_TIME = 3               # ms (timestamp)
-RENDER_TIME = 4             # ms (timestamp)
-ENCODED_FRAME_SIZE = 5      # bytes
-PSNR = 6
-SSIM = 7
-ENCODE_TIME = 8             # ms (time interval)
+INPUT_TIME = 1              # ms
+SEND_TIME = 2               # ms
+RECV_TIME = 3               # ms
+ENCODED_FRAME_SIZE = 4      # bytes
+PSNR = 5
+SSIM = 6
+RENDER_TIME = 7             # ms
 
-TOTAL_RAW_FIELDS = 9
+TOTAL_RAW_FIELDS = 8
 
 SENDER_TIME = TOTAL_RAW_FIELDS + 0
 RECEIVER_TIME = TOTAL_RAW_FIELDS + 1
@@ -67,7 +66,6 @@
     (PSNR, "psnr", "PSNR"),
     (SSIM, "ssim", "SSIM"),
     (RENDER_TIME, "render_time_ms", "render time"),
-    (ENCODE_TIME, "encode_time_ms", "encode time"),
     # Auto-generated
     (SENDER_TIME, "sender_time", "sender time"),
     (RECEIVER_TIME, "receiver_time", "receiver time"),