Revert of Add command buffer support for GL_EXT_texture_sRGB_decode

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index ba0f616d7b2eb98ed9e0906040af90708c4c6d31..cd87ab2aebad6550115babf1bb315cb207bff222 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -619,12 +619,6 @@
     }
   }
 
-  // The extension GL_EXT_texture_sRGB_decode is the same on desktop and GLES.
-  if (extensions.Contains("GL_EXT_texture_sRGB_decode") && !IsWebGLContext()) {
-    AddExtensionString("GL_EXT_texture_sRGB_decode");
-    validators_.texture_parameter.AddValue(GL_TEXTURE_SRGB_DECODE_EXT);
-  }
-
   // On desktop, GL_EXT_texture_sRGB is required regardless of GL version,
   // since the sRGB formats in OpenGL 3.0 Core do not support S3TC.
   // TODO(kainino): Support GL_EXT_texture_compression_s3tc_srgb once ratified.