SkCamera is going away -- so we can't remove it if it aint there

See https://skia-review.googlesource.com/c/skia/+/284323

Change-Id: I2f1cf0bb519e07710b5bf179b3b69ae00ff07ebb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153832
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760465}

skia/BUILD.gn

@@ -382,7 +382,6 @@ component("skia") {
 
   # Remove unused util sources.
   sources -= [
-    "//third_party/skia/src/utils/SkCamera.cpp",
     "//third_party/skia/src/utils/SkFrontBufferedStream.cpp",
     "//third_party/skia/src/utils/SkInterpolator.cpp",
     "//third_party/skia/src/utils/SkParsePath.cpp",