Removed 'in' from Skia runtime color filter.

The Skia shading language has changed slightly, necessitating the
removal of 'in' from the uniforms in this code. See the comment at
GrSkSLFP.h:41 for an explanation of how 'in' and 'uniform' work in
runtime shaders now.

Change-Id: I9cfef99f51cfb2c7cd37b284b2506dd261d8e87d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827998
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702101}

components/viz/service/display/skia_renderer.cc

@@ -1552,8 +1552,8 @@ sk_sp<SkColorFilter> SkiaRenderer::GetColorFilter(const gfx::ColorSpace& src,
       return nullptr;
 
     const char* hdr = R"(
-layout(ctype=float) in uniform half offset;
-layout(ctype=float) in uniform half multiplier;
+layout(ctype=float) uniform half offset;
+layout(ctype=float) uniform half multiplier;
 
 void main(inout half4 color) {
   // un-premultiply alpha