Remvoe redundent ifdef for ChromeOSDirectVideo flag

This block already is inside of the OS_CHROMEOS block so there is no
need for another check. This makes the block easier to reason about.

Bug: none
Change-Id: I23f5bd494e45e7699eefc7b6e9c102680ddf928e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490988Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Trent Begin <tbegin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819937}

chrome/browser/flag_descriptions.cc

@@ -3668,7 +3668,7 @@ const char kCameraSystemWebAppName[] = "Camera System Web App";
 const char kCameraSystemWebAppDescription[] =
     "Run the Chrome Camera App as a System Web App.";
 
-#if defined(OS_CHROMEOS) && BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
+#if BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
 const char kChromeOSDirectVideoDecoderName[] = "ChromeOS Direct Video Decoder";
 const char kChromeOSDirectVideoDecoderDescription[] =
     "Enables the hardware-accelerated ChromeOS direct media::VideoDecoder "
@@ -3677,7 +3677,7 @@ const char kChromeOSDirectVideoDecoderDescription[] =
     "which is added for platforms where said direct VideoDecoder does not work "
     "or is not well tested (see the disable_cros_video_decoder USE flag in "
     "Chrome OS)";
-#endif  // defined(OS_CHROMEOS) && BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
+#endif  // BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
 
 const char kCdmFactoryDaemonName[] = "CDM Factory Daemon";
 const char kCdmFactoryDaemonDescription[] =

chrome/browser/flag_descriptions.h

@@ -2119,10 +2119,10 @@ extern const char kBluetoothFixA2dpPacketSizeDescription[];
 extern const char kCameraSystemWebAppName[];
 extern const char kCameraSystemWebAppDescription[];
 
-#if defined(OS_CHROMEOS) && BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
+#if BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
 extern const char kChromeOSDirectVideoDecoderName[];
 extern const char kChromeOSDirectVideoDecoderDescription[];
-#endif  // defined(OS_CHROMEOS) && BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
+#endif  // BUILDFLAG(USE_CHROMEOS_MEDIA_ACCELERATION)
 
 extern const char kCdmFactoryDaemonName[];
 extern const char kCdmFactoryDaemonDescription[];