gn: Drop NaCl gcc-newlib toolchains

build/toolchain/nacl/BUILD.gn

Index: build/toolchain/nacl/BUILD.gn
diff --git a/build/toolchain/nacl/BUILD.gn b/build/toolchain/nacl/BUILD.gn
index c3dcaf17c9e363dde3092257a62b72c8c544dde3..6ff9a31c02e5069eba62d165a0a6ea8efa0dae84 100644
--- a/build/toolchain/nacl/BUILD.gn
+++ b/build/toolchain/nacl/BUILD.gn
@@ -17,55 +17,12 @@ os_toolchain_dir = "${nacl_toolchain_dir}/${current_os}_x86"
 # single batch to amortize python startup, etc.
 revisions = exec_script("//native_client/build/get_toolchain_revision.py",
                         [
-                          "nacl_arm_newlib",
-                          "nacl_x86_newlib",
                           "nacl_x86_glibc",
                           "pnacl_newlib",
                         ],
                         "trim list lines")
-nacl_arm_newlib_rev = revisions[0]
-nacl_x86_newlib_rev = revisions[1]
-nacl_x86_glibc_rev = revisions[2]
-pnacl_newlib_rev = revisions[3]
-
-nacl_toolchain("newlib_arm") {
-  toolchain_package = "nacl_arm_newlib"
-  toolchain_revision = nacl_arm_newlib_rev
-  toolchain_cpu = "arm"
-  toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/arm-nacl-"
-  is_clang = false
-
-  cc = toolprefix + "gcc"
-  cxx = toolprefix + "g++"
-  ar = toolprefix + "ar"
-  ld = cxx
-}
-
-nacl_toolchain("newlib_x86") {
-  toolchain_package = "nacl_x86_newlib"
-  toolchain_revision = nacl_x86_newlib_rev
-  toolchain_cpu = "x86"
-  toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/i686-nacl-"
-  is_clang = false
-
-  cc = toolprefix + "gcc"
-  cxx = toolprefix + "g++"
-  ar = toolprefix + "ar"
-  ld = cxx
-}
-
-nacl_toolchain("newlib_x64") {
-  toolchain_package = "nacl_x86_newlib"
-  toolchain_revision = nacl_x86_newlib_rev
-  toolchain_cpu = "x64"
-  toolprefix = "${os_toolchain_dir}/${toolchain_package}/bin/x86_64-nacl-"
-  is_clang = false
-
-  cc = toolprefix + "gcc"
-  cxx = toolprefix + "g++"
-  ar = toolprefix + "ar"
-  ld = cxx
-}
+nacl_x86_glibc_rev = revisions[0]
+pnacl_newlib_rev = revisions[1]
 
 nacl_toolchain("newlib_pnacl") {
   toolchain_package = "pnacl_newlib"