detach -> release

The C++ standard library uses the name "release" for the operation we call "detach".

Rewriting each "detach(" to "release(" brings us a step closer to using standard library types directly (e.g. std::unique_ptr instead of SkAutoTDelete).

This was a fairly blind transformation.  There may have been unintentional conversions in here, but it's probably for the best to have everything uniformly say "release".

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1809733002

Review URL: https://codereview.chromium.org/1809733002
diff --git a/src/effects/gradients/SkGradientBitmapCache.cpp b/src/effects/gradients/SkGradientBitmapCache.cpp
index 24e7f58..cba103b 100644
--- a/src/effects/gradients/SkGradientBitmapCache.cpp
+++ b/src/effects/gradients/SkGradientBitmapCache.cpp
@@ -51,7 +51,7 @@
     }
 }
 
-SkGradientBitmapCache::Entry* SkGradientBitmapCache::detach(Entry* entry) const {
+SkGradientBitmapCache::Entry* SkGradientBitmapCache::release(Entry* entry) const {
     if (entry->fPrev) {
         SkASSERT(fHead != entry);
         entry->fPrev->fNext = entry->fNext;
@@ -90,7 +90,7 @@
                 *bm = entry->fBitmap;
             }
             // move to the head of our list, so we purge it last
-            this->detach(entry);
+            this->release(entry);
             this->attachToHead(entry);
             return true;
         }
@@ -104,7 +104,7 @@
 
     if (fEntryCount == fMaxEntries) {
         SkASSERT(fTail);
-        delete this->detach(fTail);
+        delete this->release(fTail);
         fEntryCount -= 1;
     }