Revert of Fix memory leak in "Begin atlasing"   (https://codereview.chromium.org/361663002/)

Reason for revert:
Sigh

Original issue's description:
> Fix memory leak in (Begin atlasing  https://codereview.chromium.org/354533004/)
>
> TBR=bsalomon@google.com
>
> Committed: https://skia.googlesource.com/skia/+/40d9c0e331fe2b76b4e13ca6cdf1ea50451ba6cc

R=bsalomon@google.com
TBR=bsalomon@google.com
NOTREECHECKS=true
NOTRY=true

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/360663002
diff --git a/src/gpu/GrLayerCache.cpp b/src/gpu/GrLayerCache.cpp
index eb0cc8a..5f657c7 100644
--- a/src/gpu/GrLayerCache.cpp
+++ b/src/gpu/GrLayerCache.cpp
@@ -47,7 +47,6 @@
 }
 
 GrLayerCache::~GrLayerCache() {
-    this->freeAll();
 }
 
 void GrLayerCache::initAtlas() {