Revert of Select correct copy method for DoCopySubTexture

gpu/command_buffer/common/gles2_cmd_utils.cc

Index: gpu/command_buffer/common/gles2_cmd_utils.cc
diff --git a/gpu/command_buffer/common/gles2_cmd_utils.cc b/gpu/command_buffer/common/gles2_cmd_utils.cc
index 6eb9b8e0827283f571e4fe4879ce80b9f9a90feb..7d97aeb6c505b25dbf8e8dabd96b828852296661 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils.cc
@@ -1309,18 +1309,6 @@
   }
 }
 
-GLint GLES2Util::GetColorEncodingFromInternalFormat(uint32_t internalformat) {
-  switch (internalformat) {
-    case GL_SRGB_EXT:
-    case GL_SRGB_ALPHA_EXT:
-    case GL_SRGB8:
-    case GL_SRGB8_ALPHA8:
-      return GL_SRGB;
-    default:
-      return GL_LINEAR;
-  }
-}
-
 void GLES2Util::GetColorFormatComponentSizes(
     uint32_t internal_format, uint32_t type, int* r, int* g, int* b, int* a) {
   DCHECK(r && g && b && a);