Rename kTexture2DISampler to kITexture2DSampler.

Also remove unused kGrSLTypeCount.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4903

Change-Id: I7f934c56515424b2668886dec2f16296a1256e2c
Reviewed-on: https://skia-review.googlesource.com/4903
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
diff --git a/src/gpu/vk/GrVkUniformHandler.cpp b/src/gpu/vk/GrVkUniformHandler.cpp
index 612d0db..dcfefbf 100644
--- a/src/gpu/vk/GrVkUniformHandler.cpp
+++ b/src/gpu/vk/GrVkUniformHandler.cpp
@@ -39,7 +39,7 @@
         case kVoid_GrSLType:
         case kBool_GrSLType:
         case kTexture2DSampler_GrSLType:
-        case kTexture2DISampler_GrSLType:
+        case kITexture2DSampler_GrSLType:
         case kTextureExternalSampler_GrSLType:
         case kTexture2DRectSampler_GrSLType:
         case kTextureBufferSampler_GrSLType:
@@ -80,7 +80,7 @@
         case kVoid_GrSLType:
         case kBool_GrSLType:
         case kTexture2DSampler_GrSLType:
-        case kTexture2DISampler_GrSLType:
+        case kITexture2DSampler_GrSLType:
         case kTextureExternalSampler_GrSLType:
         case kTexture2DRectSampler_GrSLType:
         case kTextureBufferSampler_GrSLType: