libvpx: use nasm

BUG=webm:1679

Change-Id: Ia2d3c1a81af2542dbe6c790405cc6d0492391005
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136987Reviewed-by: James Zern <jzern@google.com>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#756928}

third_party/libvpx/BUILD.gn

@@ -6,7 +6,7 @@ import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//third_party/libvpx/libvpx_srcs.gni")
-import("//third_party/yasm/yasm_assemble.gni")
+import("//third_party/nasm/nasm_assemble.gni")
 
 # Sets the architecture name for building libvpx.
 if (current_cpu == "x86") {
@@ -101,7 +101,7 @@ config("libvpx_external_config") {
 }
 
 if (current_cpu == "x86" || (current_cpu == "x64" && !is_msan)) {
-  yasm_assemble("libvpx_yasm") {
+  nasm_assemble("libvpx_asm") {
     if (current_cpu == "x86") {
       sources = libvpx_srcs_x86_assembly
     } else if (current_cpu == "x64") {
@@ -344,6 +344,7 @@ static_library("libvpx") {
   deps = []
   if (current_cpu == "x86" || (current_cpu == "x64" && !is_msan)) {
     deps += [
+      ":libvpx_asm",
       ":libvpx_intrinsics_avx",
       ":libvpx_intrinsics_avx2",
       ":libvpx_intrinsics_avx512",
@@ -351,7 +352,6 @@ static_library("libvpx") {
       ":libvpx_intrinsics_sse2",
       ":libvpx_intrinsics_sse4_1",
       ":libvpx_intrinsics_ssse3",
-      ":libvpx_yasm",
     ]
   }
   if (cpu_arch_full == "arm-neon-cpu-detect") {