Remove compressed (ETC1) texture support from Ganesh (take 2)

Reland of https://skia-review.googlesource.com/c/17456/ (Remove compressed (ETC1) texture support from Ganesh) but w/o removing third_part\etc1 files

TBR=bsalomon@google.com
Change-Id: I8ec4b7e3ddf47d213cb24c382731c050ffb8847f
Reviewed-on: https://skia-review.googlesource.com/17700
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/tests/ProxyTest.cpp b/tests/ProxyTest.cpp
index 0bd8537..1799a75 100644
--- a/tests/ProxyTest.cpp
+++ b/tests/ProxyTest.cpp
@@ -118,7 +118,7 @@
     for (auto origin : { kBottomLeft_GrSurfaceOrigin, kTopLeft_GrSurfaceOrigin }) {
         for (auto widthHeight : { 100, 128, 1048576 }) {
             for (auto config : { kAlpha_8_GrPixelConfig, kRGB_565_GrPixelConfig,
-                                 kETC1_GrPixelConfig, kRGBA_8888_GrPixelConfig }) {
+                                 kRGBA_8888_GrPixelConfig }) {
                 for (auto fit : { SkBackingFit::kExact, SkBackingFit::kApprox }) {
                     for (auto budgeted : { SkBudgeted::kYes, SkBudgeted::kNo }) {
                         for (auto numSamples : { 0, 4, 16, 128 }) {