Remove --no-sandbox flag from command line for telemetry

components/tracing/docs/memory_infra.md

 # MemoryInfra
 
 MemoryInfra is a timeline-based profiling system integrated in chrome://tracing.
 It aims at creating Chrome-scale memory measurement tooling so that on any
 Chrome in the world --- desktop, mobile, Chrome OS or any other --- with the
 click of a button you can understand where memory is being used in your system.
 
 [TOC]
 
 ## Getting Started
 
  1. Get a bleeding-edge or tip-of-tree build of Chrome.
 
  2. [Record a trace as usual][record-trace]: open [chrome://tracing][tracing]
     on Desktop Chrome or [chrome://inspect?tracing][inspect-tracing] to trace
     Chrome for Android.
 
  3. Make sure to enable the **memory-infra** category on the right.
 
       ![Tick the memory-infra checkbox when recording a trace.][memory-infra-box]
 
- 4. For now, some subsystems only work if Chrome is started with the

[Primiano Tucci (use gerrit), 2016/01/21 16:58:52]

I think you want to keep this for a while, as ppl will still need for the
current stable / beta

[ssid, 2016/01/25 14:44:53]

Done.

-    `--no-sandbox` flag. 
-    <!-- TODO(primiano) TODO(ssid): https://crbug.com/461788 -->
-
 [record-trace]:     https://sites.google.com/a/chromium.org/dev/developers/how-tos/trace-event-profiling-tool/recording-tracing-runs
 [tracing]:          chrome://tracing
 [inspect-tracing]:  chrome://inspect?tracing
 [memory-infra-box]: https://drive.google.com/uc?export=view&id=0Bx14iZPZRgb5RHBJM1llY1g4cDg
 
 ![Timeline View and Analysis View][tracing-views]
 
 After recording a trace, you will see the **timeline view**. Timeline view
 shows:
 
@@ skipping 123 matching lines @@
 
 Chrome-side design docs:
 
 <iframe width="100%" height="300px" src="https://docs.google.com/a/google.com/embeddedfolderview?id=0B3KuDeqD-lVJfndSa2dleUQtMnZDeWpPZk1JV0QtbVM5STkwWms4YThzQ0pGTmU1QU9kNVk">
 </iframe>
 
 Catapult-side design docs:
 
 <iframe width="100%" height="300px" src="https://docs.google.com/a/google.com/embeddedfolderview?id=0B3KuDeqD-lVJfm10bXd5YmRNWUpKOElOWS0xdU1tMmV1S3F4aHo0ZDJLTmtGRy1qVnQtVWM">
 </iframe>