Remove obsoleted target_arch==armv7 from opus.gyp.

third_party/opus/BUILD.gn

Index: third_party/opus/BUILD.gn
diff --git a/third_party/opus/BUILD.gn b/third_party/opus/BUILD.gn
index 686a6b958dcd0bffe8fc30b22568f00c06f89040..aa646df121e5faa3f8b7e47bbfd38b3a0b853d00 100644
--- a/third_party/opus/BUILD.gn
+++ b/third_party/opus/BUILD.gn
@@ -5,14 +5,15 @@
 import("//build/config/arm.gni")
 
 # If fixed point implementation shall be used (otherwise float).
-use_opus_fixed_point = ((is_android || is_chromeos ||
-                         (is_ios && arm_version == 7)) && cpu_arch == "arm")
+use_opus_fixed_point = (cpu_arch == "arm" || cpu_arch == "arm64")
 
 # If ARM optimizations shall be used to accelerate performance.
-use_opus_arm_optimization = use_opus_fixed_point
+use_opus_arm_optimization = (cpu_arch == "arm")
 
 # If OPUS Run Time CPU Detections (RTCD) shall be used.
-use_opus_rtcd = ((is_android || is_chromeos) && cpu_arch == "arm")
+# Based on the conditions in celt/arm/armcpu.c:
+# defined(_MSC_VER) || defined(__linux__).
+use_opus_rtcd = (cpu_arch == "arm" && (is_win || is_android || is_desktop_linux || is_chromeos))
 
 config("opus_config") {
   include_dirs = [
@@ -83,6 +84,11 @@ source_set("opus") {
     ]
   }
 
+  if (is_posix && (cpu_arch == "arm" || cpu_arch == "arm64")) {
+    cflags -= [ "-Os" ]
+    cflags += [ "-O3" ]
+  }
+
   if (use_opus_fixed_point) {
     sources += gypi_values.opus_fixed_sources