Revert "Support decoding images to multiple formats, depending on usage"

This reverts commit c73a1ecbed64652b3d7aa8dc6face9a2205ce830.

Reason for revert: ANGLE and CommandBuffer failures

Original change's description:
> Support decoding images to multiple formats, depending on usage
> 
> Our codec generator will now preserve any asked-for color space, and
> convert the encoded data to that representation. Cacherator now
> allows decoding an image to both legacy (nullptr color space), and
> color-correct formats. In color-correct mode, we choose the best
> decoded format, based on the original properties, and our backend's
> capabilities. Preference is given to the native format, when it's
> already texturable (sRGB 8888 or F16 linear). Otherwise, we prefer
> linear F16, and fall back to sRGB when that's not an option.
> 
> BUG=skia:5907
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4438
> 
> Change-Id: I847c243dcfb72d8c0f1f6fc73c09547adea933f0
> Reviewed-on: https://skia-review.googlesource.com/4438
> Reviewed-by: Matt Sarett <msarett@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> 

TBR=mtklein@google.com,bsalomon@google.com,msarett@google.com,brianosman@google.com,reed@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I1818f937464573d601f64e5a1f1eb43f5a778f4e
Reviewed-on: https://skia-review.googlesource.com/4832
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/pdf/SkPDFBitmap.cpp b/src/pdf/SkPDFBitmap.cpp
index ea6887a..2d789d0 100644
--- a/src/pdf/SkPDFBitmap.cpp
+++ b/src/pdf/SkPDFBitmap.cpp
@@ -17,7 +17,7 @@
 #include "SkUnPreMultiply.h"
 
 void image_get_ro_pixels(const SkImage* image, SkBitmap* dst) {
-    if(as_IB(image)->getROPixels(dst, SkDestinationSurfaceColorMode::kLegacy)
+    if(as_IB(image)->getROPixels(dst)
        && dst->dimensions() == image->dimensions()) {
         if (dst->colorType() != kIndex_8_SkColorType) {
             return;
@@ -502,8 +502,7 @@
     if (pixelSerializer) {
         SkBitmap bm;
         SkAutoPixmapUnlock apu;
-        if (as_IB(image.get())->getROPixels(&bm, SkDestinationSurfaceColorMode::kLegacy) &&
-            bm.requestLock(&apu)) {
+        if (as_IB(image.get())->getROPixels(&bm) && bm.requestLock(&apu)) {
             data.reset(pixelSerializer->encode(apu.pixmap()));
             if (data && SkIsJFIF(data.get(), &info)) {
                 bool yuv = info.fType == SkJFIFInfo::kYCbCr;