Remove MIPS support

build/config/sysroot.gni

Index: build/config/sysroot.gni
diff --git a/build/config/sysroot.gni b/build/config/sysroot.gni
index bb29e6c1340e70af8695f0a1927d02b3665446f5..1eed2e883fb39f4f5ffb7d083ade58a9660ba411 100644
--- a/build/config/sysroot.gni
+++ b/build/config/sysroot.gni
@@ -33,14 +33,10 @@ if (current_toolchain == default_toolchain && target_sysroot != "") {
     sysroot = rebase_path("$android_ndk_root/$x86_android_sysroot_subdir")
   } else if (current_cpu == "arm") {
     sysroot = rebase_path("$android_ndk_root/$arm_android_sysroot_subdir")
-  } else if (current_cpu == "mipsel") {
-    sysroot = rebase_path("$android_ndk_root/$mips_android_sysroot_subdir")
   } else if (current_cpu == "x64") {
     sysroot = rebase_path("$android_ndk_root/$x86_64_android_sysroot_subdir")
   } else if (current_cpu == "arm64") {
     sysroot = rebase_path("$android_ndk_root/$arm64_android_sysroot_subdir")
-  } else if (current_cpu == "mips64") {
-    sysroot = rebase_path("$android_ndk_root/$mips64_android_sysroot_subdir")
   } else {
     sysroot = ""
   }