Bug 1663963 - Remove expired scroll anchor adjustment telemetry r=rhunt

Differential Revision: https://phabricator.services.mozilla.com/D89650

dom/base/Document.cpp

@@ -1376,8 +1376,6 @@ Document::Document(const char* aContentType)
       mSubDocuments(nullptr),
       mHeaderData(nullptr),
       mFlashClassification(FlashClassification::Unknown),
-      mScrollAnchorAdjustmentLength(0),
-      mScrollAnchorAdjustmentCount(0),
       mServoRestyleRootDirtyBits(0),
       mThrowOnDynamicMarkupInsertionCounter(0),
       mIgnoreOpensDuringUnloadCounter(0),
@@ -9968,11 +9966,6 @@ void Document::RemoveMetaViewportElement(HTMLMetaElement* aElement) {
   }
 }
 
-void Document::UpdateForScrollAnchorAdjustment(nscoord aLength) {
-  mScrollAnchorAdjustmentLength += abs(aLength);
-  mScrollAnchorAdjustmentCount += 1;
-}
-
 EventListenerManager* Document::GetOrCreateListenerManager() {
   if (!mListenerManager) {
     mListenerManager =
@@ -15094,15 +15087,6 @@ void Document::ReportUseCounters() {
       }
     }
   }
-
-  if (IsTopLevelContentDocument()) {
-    CSSIntCoord adjustmentLength =
-        CSSPixel::FromAppUnits(mScrollAnchorAdjustmentLength).Rounded();
-    Telemetry::Accumulate(Telemetry::SCROLL_ANCHOR_ADJUSTMENT_LENGTH,
-                          adjustmentLength);
-    Telemetry::Accumulate(Telemetry::SCROLL_ANCHOR_ADJUSTMENT_COUNT,
-                          mScrollAnchorAdjustmentCount);
-  }
 }
 
 void Document::UpdateIntersectionObservations(TimeStamp aNowTime) {

dom/base/Document.h

@@ -1247,8 +1247,6 @@ class Document : public nsINode,
   // Returns a ViewportMetaData for this document.
   ViewportMetaData GetViewportMetaData() const;
 
-  void UpdateForScrollAnchorAdjustment(nscoord aLength);
-
   /**
    * True iff this doc will ignore manual character encoding overrides.
    */
@@ -4915,9 +4913,6 @@ class Document : public nsINode,
 
   nsCString mScrollToRef;
 
-  nscoord mScrollAnchorAdjustmentLength;
-  int32_t mScrollAnchorAdjustmentCount;
-
   // Weak reference to the scope object (aka the script global object)
   // that, unlike mScriptGlobalObject, is never unset once set. This
   // is a weak reference to avoid leaks due to circular references.

layout/generic/ScrollAnchorContainer.cpp

@@ -490,7 +490,6 @@ void ScrollAnchorContainer::ApplyAdjustments() {
   if (mScrollFrame->mIsRoot) {
     pc->PresShell()->RootScrollFrameAdjusted(physicalAdjustment.y);
   }
-  pc->Document()->UpdateForScrollAnchorAdjustment(logicalAdjustment);
 
   // The anchor position may not be in the same relative position after
   // adjustment. Update ourselves so we have consistent state.

toolkit/components/telemetry/Histograms.json

@@ -14955,34 +14955,6 @@
     "bug_numbers": [1499418],
     "description": "GeckoView: Time taken to initialize all GeckoView modules in ms."
   },
-  "SCROLL_ANCHOR_ADJUSTMENT_LENGTH": {
-    "record_in_processes": ["main", "content"],
-    "products": ["firefox", "fennec"],
-    "alert_emails": [
-      "rhunt@mozilla.com"
-    ],
-    "expires_in_version": "70",
-    "kind": "exponential",
-    "low": 1,
-    "high": 10000,
-    "n_buckets": 50,
-    "bug_numbers": [1518624],
-    "description": "The absolute length in CSS pixels of all scroll adjustments performed by scroll anchoring in a top-level document."
-  },
-  "SCROLL_ANCHOR_ADJUSTMENT_COUNT": {
-    "record_in_processes": ["main", "content"],
-    "products": ["firefox", "fennec"],
-    "alert_emails": [
-      "rhunt@mozilla.com"
-    ],
-    "expires_in_version": "70",
-    "kind": "exponential",
-    "low": 1,
-    "high": 500,
-    "n_buckets": 50,
-    "bug_numbers": [1518624],
-    "description": "The amount of scroll adjustments performed by scroll anchoring in a top-level document."
-  },
   "QM_INIT_TELEMETRY_ERROR": {
       "record_in_processes": ["main"],
       "products": ["firefox", "fennec"],