Remove usage of webrtc::ColorSpace::XXX:kInvalid

The kInvalid enum entries will be removed since they are not part of
the standard T-REC H.273. kUNSPECIFIED may be used instead.

Bug: webrtc:8651
Change-Id: I71ac3f5eebf73cb4188c5e15532b289a4be1bc50
Reviewed-on: https://chromium-review.googlesource.com/c/1343108Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Johannes Kron <kron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609739}

content/renderer/media/webrtc/webrtc_video_utils.cc

@@ -59,7 +59,6 @@ media::VideoColorSpace WebRtcToMediaVideoColorSpace(
     case webrtc::ColorSpace::PrimaryID::kJEDECP22:
       primaries = media::VideoColorSpace::PrimaryID::EBU_3213_E;
       break;
-    case webrtc::ColorSpace::PrimaryID::kInvalid:
     default:
       break;
   }
@@ -115,7 +114,6 @@ media::VideoColorSpace WebRtcToMediaVideoColorSpace(
     case webrtc::ColorSpace::TransferID::kARIB_STD_B67:
       transfer = media::VideoColorSpace::TransferID::ARIB_STD_B67;
       break;
-    case webrtc::ColorSpace::TransferID::kInvalid:
     default:
       break;
   }
@@ -153,7 +151,6 @@ media::VideoColorSpace WebRtcToMediaVideoColorSpace(
     case webrtc::ColorSpace::MatrixID::kSMPTE2085:
       matrix = media::VideoColorSpace::MatrixID::YDZDX;
       break;
-    case webrtc::ColorSpace::MatrixID::kInvalid:
     default:
       break;
   }
@@ -166,7 +163,6 @@ media::VideoColorSpace WebRtcToMediaVideoColorSpace(
     case webrtc::ColorSpace::RangeID::kFull:
       range = gfx::ColorSpace::RangeID::FULL;
       break;
-    case webrtc::ColorSpace::RangeID::kInvalid:
     default:
       break;
   }