move blurimagefilter.cpp back into effects

Bug: skia:
Change-Id: I5711a9a8fcd135344e75cb4b505bd06044414c85
Reviewed-on: https://skia-review.googlesource.com/137581
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Reed <reed@google.com>

gn/core.gni

@@ -54,7 +54,6 @@ skia_core_sources = [
   "$_src/core/SkBlitter_ARGB32.cpp",
   "$_src/core/SkBlitter_RGB565.cpp",
   "$_src/core/SkBlitter_Sprite.cpp",
-  "$_src/core/SkBlurImageFilter.cpp",
   "$_src/core/SkBlurMask.cpp",
   "$_src/core/SkBlurMask.h",
   "$_src/core/SkBlurMF.cpp",

gn/effects_imagefilters.gni

@@ -12,6 +12,7 @@ skia_effects_imagefilter_sources = [
 
   "$_src/effects/imagefilters/SkAlphaThresholdFilter.cpp",
   "$_src/effects/imagefilters/SkArithmeticImageFilter.cpp",
+  "$_src/effects/imagefilters/SkBlurImageFilter.cpp",
   "$_src/effects/imagefilters/SkColorFilterImageFilter.cpp",
   "$_src/effects/imagefilters/SkComposeImageFilter.cpp",
   "$_src/effects/imagefilters/SkDisplacementMapEffect.cpp",
@@ -30,6 +31,7 @@ skia_effects_imagefilter_sources = [
 
   "$_include/effects/SkAlphaThresholdFilter.h",
   "$_include/effects/SkArithmeticImageFilter.h",
+  "$_include/effects/SkBlurImageFilter.h",
   "$_include/effects/SkColorFilterImageFilter.h",
   "$_include/effects/SkDisplacementMapEffect.h",
   "$_include/effects/SkDropShadowImageFilter.h",