Revert of Always use valid enum values in gfx::ColorSpace

ui/gfx/color_space.h

Index: ui/gfx/color_space.h
diff --git a/ui/gfx/color_space.h b/ui/gfx/color_space.h
index 81919bcccf49b5f87e1a48285ce6f5e29f57b5bb..6e351899e16fe3f4523a17f571c6e873d5eb6e26 100644
--- a/ui/gfx/color_space.h
+++ b/ui/gfx/color_space.h
@@ -43,13 +43,11 @@
     SMPTEST431_2 = 11,
     SMPTEST432_1 = 12,
 
-    LAST_STANDARD_VALUE = SMPTEST432_1,
-
     // Chrome-specific values start at 1000.
-    UNKNOWN = 1000,
-    XYZ_D50,
-    CUSTOM,
-    LAST = UNKNOWN
+    XYZ_D50 = 1000,
+    // TODO(hubbe): We need to store the primaries.
+    CUSTOM = 1001,
+    LAST = CUSTOM
   };
 
   enum class TransferID : uint16_t {
@@ -73,11 +71,8 @@
     SMPTEST2084 = 16,
     SMPTEST428_1 = 17,
 
-    LAST_STANDARD_VALUE = SMPTEST428_1,
-
     // Chrome-specific values start at 1000.
-    UNKNOWN = 1000,
-    GAMMA24,
+    GAMMA24 = 1000,
 
     // This is an ad-hoc transfer function that decodes SMPTE 2084 content
     // into a 0-1 range more or less suitable for viewing on a non-hdr
@@ -104,11 +99,8 @@
     BT2020_CL = 10,
     YDZDX = 11,
 
-    LAST_STANDARD_VALUE = YDZDX,
-
     // Chrome-specific values start at 1000
-    UNKNOWN = 1000,
-    LAST = UNKNOWN,
+    LAST = YDZDX,
   };
 
   // The h264 spec declares this as bool, so only the the first two values
@@ -127,11 +119,6 @@
              TransferID transfer,
              MatrixID matrix,
              RangeID full_range);
-  ColorSpace(int primaries, int transfer, int matrix, RangeID full_range);
-
-  static PrimaryID PrimaryIDFromInt(int primary_id);
-  static TransferID TransferIDFromInt(int transfer_id);
-  static MatrixID MatrixIDFromInt(int matrix_id);
 
   static ColorSpace CreateSRGB();
   static ColorSpace CreateXYZD50();