Update from https://crrev.com/317530

build/toolchain/linux/BUILD.gn

Index: build/toolchain/linux/BUILD.gn
diff --git a/build/toolchain/linux/BUILD.gn b/build/toolchain/linux/BUILD.gn
index 1d17772222f0bea73dc3a8601ed3b512a7f63dc3..7bcd9d01170e5a5a86d53e4fd69ef78eccae712c 100644
--- a/build/toolchain/linux/BUILD.gn
+++ b/build/toolchain/linux/BUILD.gn
@@ -24,7 +24,7 @@ gcc_toolchain("arm") {
   ar = "arm-linux-gnueabi-ar"
   ld = cxx
 
-  toolchain_cpu_arch = "arm"
+  toolchain_cpu = "arm"
   toolchain_os = "linux"
   is_clang = false
 }
@@ -43,7 +43,7 @@ gcc_toolchain("clang_x86") {
   ar = "ar"
   ld = cxx
 
-  toolchain_cpu_arch = "x86"
+  toolchain_cpu = "x86"
   toolchain_os = "linux"
   is_clang = true
 }
@@ -55,7 +55,7 @@ gcc_toolchain("x86") {
   ar = "ar"
   ld = cxx
 
-  toolchain_cpu_arch = "x86"
+  toolchain_cpu = "x86"
   toolchain_os = "linux"
   is_clang = false
 }
@@ -74,7 +74,7 @@ gcc_toolchain("clang_x64") {
   ar = "ar"
   ld = cxx
 
-  toolchain_cpu_arch = "x64"
+  toolchain_cpu = "x64"
   toolchain_os = "linux"
   is_clang = true
 }
@@ -86,7 +86,7 @@ gcc_toolchain("x64") {
   ar = "ar"
   ld = cxx
 
-  toolchain_cpu_arch = "x64"
+  toolchain_cpu = "x64"
   toolchain_os = "linux"
   is_clang = false
 }
@@ -97,7 +97,7 @@ gcc_toolchain("mipsel") {
   ar = "mipsel-linux-gnu-ar"
   ld = cxx
 
-  toolchain_cpu_arch = "mipsel"
+  toolchain_cpu = "mipsel"
   toolchain_os = "linux"
   is_clang = false
 }