Update build instructions for Linux and Windows.

docs/linux_build_instructions_prerequisites.md

-# Linux Build Instructions — Prerequisites
+# Linux Build Instructions Prerequisites
 
-This page describes system requirements for building Chromium on Linux.
+The contents of this page have been folded into the
+[Linux build instructions](linux_build_instructions.md).
 
-[TOC]
+This file will be deleted in the future, please update your links.
 
-## System Requirements
-
-### Linux distribution
-
-You should be able to build Chromium on any reasonably modern Linux
-distribution, but there are a lot of distributions and we sometimes break things
-on one or another. Internally, our development platform has been a variant of
-Ubuntu 14.04 (Trusty Tahr); we expect you will have the most luck on this
-platform, although directions for other popular platforms are included below.
-
-### Disk space
-
-It takes about 10GB or so of disk space to check out and build the source tree.
-This number grows over time.
-
-### Memory space
-
-It takes about 8GB of swap file to link chromium and its tests. If you get an
-out-of-memory error during the final link, you will need to add swap space with
-swapon. It's recommended to have at least 4GB of memory available for building a
-statically linked debug build. Dynamic linking and/or building a release build
-lowers memory requirements. People with less than 8GB of memory may want to not
-build tests since they are quite large.
-
-### 64-bit Systems
-
-Chromium can be compiled as either a 32-bit or 64-bit application. Chromium
-requires several system libraries to compile and run. While it is possible to
-compile and run a 32-bit Chromium on 64-bit Linux, many distributions are
-missing the necessary 32-bit libraries, and will result in build or run-time
-errors.
-
-### Depot tools
-
-Before setting up the environment, make sure you install the
-[depot tools](http://dev.chromium.org/developers/how-tos/depottools) first.
-
-## Software Requirements
-
-### Ubuntu Setup
-
-Run [build/install-build-deps.sh](/build/install-build-deps.sh) The script only
-supports current releases as listed on https://wiki.ubuntu.com/Releases.
-
-Building on Linux requires software not usually installed with the
-distributions.
-
-The script attempts to automate installing the required software. This script is
-used to set up the canonical builders, and as such is the most up to date
-reference for the required prerequisites.
-
-### Other distributions
-
-Note: Other distributions are not officially supported for building and the
-instructions below might be outdated.
-
-#### Debian Setup
-
-Follow the Ubuntu instructions above.
-
-If you want to install the build-deps manually, note that the original packages
-are for Ubuntu. Here are the Debian equivalents:
-
-*   libexpat-dev -> libexpat1-dev
-*   freetype-dev -> libfreetype6-dev
-*   libbzip2-dev -> libbz2-dev
-*   libcupsys2-dev -> libcups2-dev
-
-Additionally, if you're building Chromium components for Android, you'll need to
-install the package: lib32z1
-
-#### openSUSE Setup
-
-For openSUSE 11.0 and later, see
-[Linux openSUSE Build Instructions](linux_open_suse_build_instructions.md).
-
-#### Fedora Setup
-
-Recent systems:
-
-```shell
-su -c 'yum install subversion pkgconfig python perl gcc-c++ bison \
-flex gperf nss-devel nspr-devel gtk2-devel glib2-devel freetype-devel \
-atk-devel pango-devel cairo-devel fontconfig-devel GConf2-devel \
-dbus-devel alsa-lib-devel libX11-devel expat-devel bzip2-devel \
-dbus-glib-devel elfutils-libelf-devel libjpeg-devel \
-mesa-libGLU-devel libXScrnSaver-devel \
-libgnome-keyring-devel cups-devel libXtst-devel libXt-devel pam-devel'
-```
-
-The msttcorefonts packages can be obtained by following the instructions present
-here: http://www.fedorafaq.org/#installfonts
-
-For the optional packages:
-
-*   php-cgi is provided by the php-cli package
-*   wdiff doesn't exist in Fedora repositories, a possible alternative would be
-    dwdiff
-*   sun-java6-fonts doesn't exist in Fedora repositories, needs investigating
-
-    su -c 'yum install httpd mod_ssl php php-cli wdiff'
-
-#### Arch Linux Setup
-
-Most of these packages are probably already installed since they're often used,
-and the parameter --needed ensures that packages up to date are not reinstalled.
-
-```shell
-sudo pacman -S --needed python perl gcc gcc-libs bison flex gperf pkgconfig \
-  nss alsa-lib gconf glib2 gtk2 nspr ttf-ms-fonts freetype2 cairo dbus \
-  libgnome-keyring
-```
-
-For the optional packages on Arch Linux:
-
-*   php-cgi is provided with pacman
-*   wdiff is not in the main repository but dwdiff is. You can get wdiff in
-    AUR/yaourt
-*   sun-java6-fonts do not seem to be in main repository or AUR.
-
-For a successful build, add `'remove_webcore_debug_symbols': 1,` to the
-variables-object in include.gypi. Tested on 64-bit Arch Linux.
-
-TODO: Figure out how to make it build with the WebCore debug symbols. `make V=1`
-can be useful for solving the problem.
-
-#### Mandriva setup
-
-```shell
-urpmi lib64fontconfig-devel lib64alsa2-devel lib64dbus-1-devel \
-lib64GConf2-devel lib64freetype6-devel lib64atk1.0-devel lib64gtk+2.0_0-devel \
-lib64pango1.0-devel lib64cairo-devel lib64nss-devel lib64nspr-devel g++ python \
-perl bison flex subversion gperf
-```
-
-*** note
-Note 1: msttcorefonts are not available, you will need to build your own (see
-instructions, not hard to do, see
-[mandriva_msttcorefonts.md](mandriva_msttcorefonts.md)) or use drakfont to
-import the fonts from a windows installation
-***
-
-*** note
-Note 2: these packages are for 64 bit, to download the 32 bit packages,
-substitute lib64 with lib
-***
-
-*** note
-Note 3: some of these packages might not be explicitly necessary as they come as
-dependencies, there is no harm in including them however.
-***
-
-#### Gentoo setup
-
-    emerge www-client/chromium