See https://uberchromegw.corp.google.com/i/chromiumos.tryserver/builders/release/builds/4874

Fails during chrome build:

chromeos-chrome-54.0.2795.0_rc-r1: FAILED: nacl_bootstrap_arm/obj/native_client/src/trusted/service_runtime/linux/nacl_bootstrap_raw 
chromeos-chrome-54.0.2795.0_rc-r1: python ../../../../../../../home/chrome-bot/chrome_root/src/native_client/src/trusted/service_runtime/linux/ld_bfd.py --compiler arm-linux-gnueabihf-g++ -m armelf_linux_eabi --build-id -static -z max-page-size=0x1000 --defsym RESERVE_TOP=0x40002000 --script=/home/chrome-bot/chrome_root/src/native_client/src/trusted/service_runtime/linux/nacl_bootstrap.x -o /var/cache/chromeos-chrome/chrome-src-internal/src/out_daisy/Release/nacl_bootstrap_arm/obj/native_client/src/trusted/service_runtime/linux/nacl_bootstrap_raw --whole-archive /var/cache/chromeos-chrome/chrome-src-internal/src/out_daisy/Release/nacl_bootstrap_arm/obj/native_client/src/trusted/service_runtime/linux/libnacl_bootstrap_lib.a --no-whole-archive
chromeos-chrome-54.0.2795.0_rc-r1: /bin/sh: arm-linux-gnueabihf-g++: command not found
chromeos-chrome-54.0.2795.0_rc-r1: /bin/sh: arm-linux-gnueabihf-g++: command not found
chromeos-chrome-54.0.2795.0_rc-r1: /usr/x86_64-pc-linux-gnu/binutils-bin/2.25.51/ld.bfd.real: unrecognised emulation mode: armelf_linux_eabi
chromeos-chrome-54.0.2795.0_rc-r1: Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux elf_l1om elf_k1om
chromeos-chrome-54.0.2795.0_rc-r1: Could not find ld: None
chromeos-chrome-54.0.2795.0_rc-r1: Could not find libgcc: None