Remove deferred proxy machinery

These aren't used any more in favor of lazy proxies.

Bug: skia:11288
Change-Id: I992e1a3dd343e0ebc7f3a4f18c0054453dfebbaf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/366896
Commit-Queue: Adlai Holler <adlai@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrResourceAllocator.cpp b/src/gpu/GrResourceAllocator.cpp
index 2a1d44d..d7e6851 100644
--- a/src/gpu/GrResourceAllocator.cpp
+++ b/src/gpu/GrResourceAllocator.cpp
@@ -94,12 +94,7 @@
     if (Interval* intvl = fIntvlHash.find(proxy->uniqueID().asUInt())) {
         // Revise the interval for an existing use
 #ifdef SK_DEBUG
-        if (0 == start && 0 == end) {
-            // This interval is for the initial upload to a deferred proxy. Due to the vagaries
-            // of how deferred proxies are collected they can appear as uploads multiple times
-            // in a single opsTasks' list and as uploads in several opsTasks.
-            SkASSERT(0 == intvl->start());
-        } else if (isDirectDstRead) {
+        if (isDirectDstRead) {
             // Direct reads from the render target itself should occur w/in the existing
             // interval
             SkASSERT(intvl->start() <= start && intvl->end() >= end);