Remove GL image support from SkSL

This was added to Ganesh briefly in 2016 for an experiment, then
reverted, and never used.

Change-Id: I65849aff53acc14f9adc7585398fd09363a4ed65
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/374376
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.cpp b/src/sksl/SkSLSPIRVCodeGenerator.cpp
index a39811e..646748e 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.cpp
+++ b/src/sksl/SkSLSPIRVCodeGenerator.cpp
@@ -1996,7 +1996,7 @@
                         Modifiers(Layout(/*flags=*/0, /*location=*/-1,
                                          fProgram.fConfig->fSettings.fRTHeightOffset,
                                          /*binding=*/-1, /*index=*/-1, /*set=*/-1, /*builtin=*/-1,
-                                         /*inputAttachmentIndex=*/-1, Layout::Format::kUnspecified,
+                                         /*inputAttachmentIndex=*/-1,
                                          Layout::kUnspecified_Primitive, /*maxVertices=*/1,
                                          /*invocations=*/-1, /*marker=*/"", /*when=*/"",
                                          Layout::kNo_Key, Layout::CType::kDefault),
@@ -2018,7 +2018,7 @@
                 Modifiers modifiers(
                         Layout(flags, /*location=*/-1, /*offset=*/-1, binding, /*index=*/-1,
                                set, /*builtin=*/-1, /*inputAttachmentIndex=*/-1,
-                               Layout::Format::kUnspecified, Layout::kUnspecified_Primitive,
+                               Layout::kUnspecified_Primitive,
                                /*maxVertices=*/-1, /*invocations=*/-1, /*marker=*/"", /*when=*/"",
                                Layout::kNo_Key, Layout::CType::kDefault),
                         Modifiers::kUniform_Flag);