Delete bundled copy of NSS and replace with README.

README.chromium

Index: README.chromium
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-Name: Network Security Services (NSS)
-Short Name: nss
-URL: http://www.mozilla.org/projects/security/pki/nss/
-Version: 3.21
-License: MPL 2
-License File: nss/COPYING
-Security Critical: yes
-
-Description:
-NSS 3.21 with NSPR 4.11
-
-This copy of NSS has been customized for Chromium.  NSPR is also put here
-rather than in a separate directory to emphasize the fact that Chromium is
-using NSPR strictly as an NSS dependency.
-
-We took a subset of NSS, omitting the SSL and SMIME libraries.
-This NSS subset satisfies the dependencies of the NSS SSL library in
-src/net/third_party/nss.  Do NOT use this copy of NSS on platforms that
-have NSS as system libraries, such as Linux.
-
-The source code was checked out from the mozilla.org CVS or hg repository using
-the nspr-checkout.sh and nss-checkout.sh scripts in the scripts directory.
-The current source code was checked out with the hg tag NSS_3_21_RTM
-and the hg tag NSPR_4_11_RTM.
-
-Local Modifications:
-
-We made the following local changes to NSPR.
-- patches/nspr-static.patch: to build NSPR as static libraries.  See NSPR
-  bug 533014 (https://bugzilla.mozilla.org/show_bug.cgi?id=533014).
-- patches/prcpucfg.h: added to the nspr/pr/include directory.
-- patches/nspr-attach-as-system-thread.patch: attach a "foreign" thread
-  (a thread not created by NSPR) to NSPR as a "system" thread rather than
-  a "user" thread, which needs to terminate before PR_Cleanup can return.
-  (The "system" vs. "user" thread distinction comes from Java, and
-  ultimately from Solaris threads.)  This is a workaround for
-  http://crbug.com/40663.
-- patches/nspr-remove-io.patch: Remove IO operations in NSPR to allow NSS
-  to work in the sandbox.  Do not initialize IO when initializing NSPR.
-  Windows version of NSPR also tried to use getaddrinfo to resolve hostname
-  in a SSL connection.  By removing _PR_HAVE_GETADDRINFO this will force it
-  to use PR_GetHostByName.  Removing _PR_INET6_PROBE will prevent it from
-  creating an IPv6 socket to probe if IPv6 is there.
-  DO NOT upstream this patch.
-
-We made the following local changes to NSS.
-
-Files Added:
-- nss/lib/ckfw/builtins/certdata.c: a generated file. Do an upstream NSS
-  build and copy the generated certdata.c.
-- nss/lib/freebl/nss_build_config_mac.h: a header that defines the target
-  arch specific configuration macros for lib/freebl on iOS and Mac OS X.
-  This works around the lack of support for the xcode_settings
-  GCC_PREPROCESSOR_DEFINITIONS[arch=foo] by the ninja GYP generator
-  (http://crbug.com/122592).
-- nss/lib/freebl/mpi/mpi_arm_mac.c: a wrapper file for mpi_arm.c for iOS
-  and Mac OS X. This works around the inability to specify target arch
-  specific source files in Xcode.
-
-Patches Applied:
-- patches/nss-remove-fortezza.patch: remove Fortezza certificate support
-  from PK11_ImportPublicKey.  See NSS bug 668397
-  (https://bugzilla.mozilla.org/show_bug.cgi?id=668397).
-- patches/nss-urandom-abort.patch: call abort() if NSS cannot read from
-  /dev/urandom.  See Chromium issue 244661 (http://crbug.com/244661).
-- patches/nss-static.patch: to build NSS as static libraries and omit
-  libpkix (the new certification path validation library) and
-  softoken/legacydb (support for the old Berkeley DB databases).  See NSS
-  bug 534471 (https://bugzilla.mozilla.org/show_bug.cgi?id=534471).
-