Remove incorrect assert

We only need to verify that we've tested the PM conversion if we're about
to use GrConfigConversionEffect. For the else case, no such guarantee is
made, so the assert is wrong.

Bug: chromium:713462
Change-Id: I5ffcc0c5f7de4e9614e9ccd83140acc9ab4f7283
Reviewed-on: https://skia-review.googlesource.com/13962
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 234303f..0edfb29 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -911,8 +911,6 @@
 sk_sp<GrFragmentProcessor> GrContext::createUPMToPMEffect(sk_sp<GrFragmentProcessor> fp,
                                                           bool useConfigConversionEffect) {
     ASSERT_SINGLE_OWNER
-    // We should have already called this->testPMConversionsIfNecessary().
-    SkASSERT(fDidTestPMConversions);
     // We have specialized effects that guarantee round-trip conversion for these formats
     if (useConfigConversionEffect) {
         // We should have already called this->validPMUPMConversionExists() in this case