media: Replace `is_desktop_linux` with `is_linux`

Now they are defined the same. Use `is_linux` everywhere to avoid
confusion.

Bug: 1132395
Change-Id: Ib6288cefb2b3447b7ead54632f31dd34d778dd6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431777Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810797}

chrome/common/BUILD.gn

@@ -477,7 +477,7 @@ static_library("common") {
     deps += [ "//media/cdm:cdm_paths" ]  # Needed by chrome_content_client.cc
 
     if (enable_widevine) {
-      if (is_desktop_linux) {
+      if (is_linux) {
         sources += [
           "media/component_widevine_cdm_hint_file_linux.cc",
           "media/component_widevine_cdm_hint_file_linux.h",

media/cdm/library_cdm/cdm_paths.gni

@@ -29,7 +29,7 @@ component_arch = "$current_cpu"
 # - |cdm_platform_specific_path| is exported as a BUILDFLAG to cdm_paths.cc.
 # - When updating the condition here, also update the condition on the define
 #   of CDM_USE_PLATFORM_SPECIFIC_PATH in cdm_paths_unittest.cc.
-if (is_win || is_mac || is_desktop_linux) {
+if (is_win || is_mac || is_linux) {
   cdm_platform_specific_path =
       "_platform_specific/$component_os" + "_" + "$component_arch"
 

media/media_options.gni

@@ -196,7 +196,7 @@ if (is_chromecast) {
     "video_decoder",
   ]
   _default_mojo_media_host = "gpu"
-} else if (is_chromeos || is_mac || is_win || (is_desktop_linux && use_vaapi)) {
+} else if (is_chromeos || is_mac || is_win || (is_linux && use_vaapi)) {
   _default_mojo_media_services = [ "video_decoder" ]
   _default_mojo_media_host = "gpu"
 }

third_party/widevine/cdm/BUILD.gn

@@ -34,7 +34,7 @@ if (bundle_widevine_cdm) {
     widevine_cdm_version_h_file =
         "chromeos/$widevine_arch/widevine_cdm_version.h"
     widevine_cdm_binary_files = [ "chromeos/$widevine_arch/libwidevinecdm.so" ]
-  } else if (is_desktop_linux) {
+  } else if (is_linux) {
     widevine_cdm_version_h_file = "linux/$widevine_arch/widevine_cdm_version.h"
     widevine_cdm_binary_files = [ "linux/$widevine_arch/libwidevinecdm.so" ]
     widevine_cdm_manifest_and_license_files = [

third_party/widevine/cdm/widevine.gni

@@ -23,7 +23,7 @@ if (is_chromeos && !is_chromeos_device) {
 # supported via Android MediaDrm API.
 library_widevine_cdm_available =
     (is_chromeos && (target_cpu == "x64" || target_cpu == "arm")) ||
-    (is_desktop_linux && (target_cpu == "x86" || target_cpu == "x64")) ||
+    (is_linux && (target_cpu == "x86" || target_cpu == "x64")) ||
     (is_mac && (target_cpu == "x64" || target_cpu == "arm64")) ||
     (is_win && (target_cpu == "x86" || target_cpu == "x64"))
 
@@ -36,8 +36,9 @@ enable_library_widevine_cdm =
 # Widevine CDM can be deployed as a component. Currently only supported on
 # Mac, Windows, and desktop Linux. The CDM can be bundled regardless whether
 # it's a component. See below.
+# Note: Not enabled on ChromeOS. See https://crbug.com/971433
 enable_widevine_cdm_component =
-    enable_library_widevine_cdm && (is_win || is_mac || is_desktop_linux)
+    enable_library_widevine_cdm && (is_win || is_mac || is_linux)
 
 # Widevine CDM is bundled as part of Google Chrome builds.
 bundle_widevine_cdm = enable_library_widevine_cdm && is_chrome_branded