Rename is_chromeos in chrome/src.

content/common/BUILD.gn

Index: content/common/BUILD.gn
diff --git a/content/common/BUILD.gn b/content/common/BUILD.gn
index 241872a397dd603aa95ddcf51f790f12e81bffd7..a57115334ec533de795a9f2e85b04aae5fbd9f64 100644
--- a/content/common/BUILD.gn
+++ b/content/common/BUILD.gn
@@ -10,7 +10,7 @@ if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
-if (is_chromeos && current_cpu != "arm") {
+if (is_chromeos_ui && current_cpu != "arm") {
   action("libva_generate_stubs") {
     extra_header = "gpu/media/va_stub_header.fragment"
 
@@ -52,7 +52,7 @@ if (is_chromeos && current_cpu != "arm") {
   }
 }
 
-if (is_chromeos && use_v4lplugin) {
+if (is_chromeos_ui && use_v4lplugin) {
   action("libv4l2_generate_stubs") {
     extra_header = "gpu/media/v4l2_stub_header.fragment"
 
@@ -309,7 +309,7 @@ source_set("common") {
       "//third_party/khronos:khronos_headers",
     ]
 
-    if (current_cpu != "arm" || !is_chromeos) {
+    if (current_cpu != "arm" || !is_chromeos_ui) {
       sources += [ "gpu/x_util.h" ]
     }
   }
@@ -343,7 +343,7 @@ source_set("common") {
     }
   }
 
-  if (is_chromeos) {
+  if (is_chromeos_ui) {
     sources += [
       "gpu/media/accelerated_video_decoder.h",
       "gpu/media/h264_decoder.cc",