Revert of GrFP can express distance vector field req., program builder declares variable for it

src/gpu/glsl/GrGLSLFragmentProcessor.cpp

Index: src/gpu/glsl/GrGLSLFragmentProcessor.cpp
diff --git a/src/gpu/glsl/GrGLSLFragmentProcessor.cpp b/src/gpu/glsl/GrGLSLFragmentProcessor.cpp
index 46945bdc6baa5e0e4f89abd2e83cab8116c5738f..9533d5a8cb2136e17bd48d2103f89141aa23c2e7 100644
--- a/src/gpu/glsl/GrGLSLFragmentProcessor.cpp
+++ b/src/gpu/glsl/GrGLSLFragmentProcessor.cpp
@@ -107,8 +107,7 @@
                        inputColor,
                        childCoords,
                        childTexSamplers,
-                       childBufferSamplers,
-                       args.fGpImplementsDistanceVector);
+                       childBufferSamplers);
     this->childProcessor(childIndex)->emitCode(childArgs);
     fragBuilder->codeAppend("}\n");