Remove dead code paths around PIXEL_STORAGE_TEXTURE in capture pipeline.

media/base/video_capture_types.h

Index: media/base/video_capture_types.h
diff --git a/media/base/video_capture_types.h b/media/base/video_capture_types.h
index d6ad5e3a736812f2d8f6ad8d0a275566402bcdaa..fa631a091e94496cb7494f163270a57d0a814e71 100644
--- a/media/base/video_capture_types.h
+++ b/media/base/video_capture_types.h
@@ -24,7 +24,6 @@ typedef int VideoCaptureSessionId;
 // TODO(mcasas): http://crbug.com/504160 Consider making this an enum class.
 enum VideoPixelStorage {
   PIXEL_STORAGE_CPU,
-  PIXEL_STORAGE_TEXTURE,
   PIXEL_STORAGE_GPUMEMORYBUFFER,
   PIXEL_STORAGE_MAX = PIXEL_STORAGE_GPUMEMORYBUFFER,
 };
@@ -126,6 +125,10 @@ typedef std::vector<VideoCaptureFormat> VideoCaptureFormats;
 struct MEDIA_EXPORT VideoCaptureParams {
   VideoCaptureParams();
 
+  // Returns true if requested_format.IsValid() and all other values are within
+  // their expected ranges.
+  bool IsValid() const;
+
   bool operator==(const VideoCaptureParams& other) const {
     return requested_format == other.requested_format &&
            resolution_change_policy == other.resolution_change_policy &&