Land chromium-side work to clean up handling of v8_target_cpu in the GN build.

build/config/mips.gni

Index: build/config/mips.gni
diff --git a/build/config/mips.gni b/build/config/mips.gni
index e23e74885919cb113792c536c2763e8b691761ef..e9d2f616d49ef8340ac551bf96a055b9f00d480f 100644
--- a/build/config/mips.gni
+++ b/build/config/mips.gni
@@ -2,13 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/v8_target_cpu.gni")
-
 # These are primarily relevant in current_cpu == "mips*" contexts, where
 # MIPS code is being compiled.  But they can also be relevant in the
 # other contexts when the code will change its behavior based on the
 # cpu it wants to generate code for.
-if (current_cpu == "mipsel" || v8_target_cpu == "mipsel") {
+if (current_cpu == "mipsel" || v8_current_cpu == "mipsel") {
   declare_args() {
     # MIPS arch variant. Possible values are:
     #   "r1"
@@ -33,7 +31,7 @@ if (current_cpu == "mipsel" || v8_target_cpu == "mipsel") {
     #   "fpxx": sets the GCC -mfpxx option.
     mips_fpu_mode = "fp32"
   }
-} else if (current_cpu == "mips64el" || v8_target_cpu == "mips64el") {
+} else if (current_cpu == "mips64el" || v8_current_cpu == "mips64el") {
   # MIPS arch variant. Possible values are:
   #   "r2"
   #   "r6"