Roll WPR to the lastest commit

telemetry/third_party/web-page-replay/documentation/GettingStarted.md

 # Prerequisites
 * A Mac running OS X 10.6 ("Snow Leopard") or Linux (tested with Ubuntu
 Lucid). Support for Windows is still experimental
 * [Python 2.6](http://www.python.org/download/releases/2.6.6/)
 
 # Install
 Only do this the first time.
 
 1. Open the Terminal application and download the source.
 ```
 $ git clone https://github.com/chromium/web-page-replay.git
 ```
 2. Move to the newly created directory.
 ```
 $ cd web-page-replay
 ```
-## Linux-specific install steps
-On Linux, Dummynet must be installed to simulate network conditions.
-
-1. For the Linux code, try downloading the [latest linux sources from Marta
-Carbone](http://info.iet.unipi.it/~marta/dummynet/). These are more up-to-date than what is found on the [Dummynet
-homepage](http://info.iet.unipi.it/~luigi/dummynet/).
-2. Build and install:
-```
-$ tar -C /tmp -xvzf ipfw3-20120119.tgz
-$ cd /tmp/ipfw3-20120119
-$ make
-[Ignore output like the following:]
-        echo "  ERROR: Kernel configuration is invalid.";\
-        echo "         include/generated/autoconf.h or
-include/config/auto.conf are missing.";\
-        echo "         Run 'make oldconfig && make prepare' on kernel
-src to fix it.";\
-[The lines will print without "echo" if there is an actual error.]
-$ sudo insmod dummynet2/ipfw_mod.ko
-$ sudo cp ipfw/ipfw /usr/local/sbin
-```
-3. To remove it later
-```
-$ sudo rmmod ipfw_mod.ko
-```
-## Windows-specific install steps
-*Windows support is experimental and not well tested.* On Windows XP, the
-Dummynet driver must be installed to simulate network conditions
-(Drivers for Windows Vista and Windows 7 are currently unavailable).
-
-1. Control Panel -> Network Connections -> Right-click adapter in use ->
-select Properties
-2. Click Install... -> Service -> Add... -> Have Disk...
-3. Browse... ->
-web-page-replay-read-only\third_party\ipfw_win32\netipfw.inf
-4. Click Open -> Ok -> Ok
-  - Accept any warnings for installing an unknown driver
+## Network simulation
+For network simulation, you can use https://github.com/WPO-Foundation/tsproxy
+which works on most platforms. More realistic network simulation options can be
+achieved through using tools like dummynet, but those only support limited
+platforms.
 
 # Record
 First you must record the web page or pages that you wish to replay.
 
 1. Open the web browser you wish to use and clear its cache so that all
 resources will be requested from the network.
 2. Switch to the Terminal application and start the program in record mode.
 All HTTP requests performed on the machine while it is running will be
 saved into the archive.
 ```
@@ skipping 96 matching lines @@
 ```
 
 # Help
 
 For full usage instructions and advanced options, see the program's
 help.
 
 ```
 $ ./replay.py --help
 ```