Migrate WTF::HashMap::get() to ::at()

third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp

Index: third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
diff --git a/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp b/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
index 01910a4a9b3acdf8f793ec6f8ab2a2d0fb1420f7..5902f5a403b3288cc9d3e81b4434de8aefb80f86 100644
--- a/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
+++ b/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
@@ -93,7 +93,7 @@ bool KeyframeEffectModelBase::snapshotNeutralCompositorKeyframes(
     if (CSSPropertyEquality::propertiesEqual(property, oldStyle, newStyle))
       continue;
     PropertySpecificKeyframeGroup* keyframeGroup =
-        m_keyframeGroups->get(PropertyHandle(property));
+        m_keyframeGroups->at(PropertyHandle(property));
     if (!keyframeGroup)
       continue;
     for (auto& keyframe : keyframeGroup->m_keyframes) {
@@ -115,7 +115,7 @@ bool KeyframeEffectModelBase::snapshotAllCompositorKeyframes(
   ensureKeyframeGroups();
   for (CSSPropertyID property : CompositorAnimations::compositableProperties) {
     PropertySpecificKeyframeGroup* keyframeGroup =
-        m_keyframeGroups->get(PropertyHandle(property));
+        m_keyframeGroups->at(PropertyHandle(property));
     if (!keyframeGroup)
       continue;
     for (auto& keyframe : keyframeGroup->m_keyframes) {