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

third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp

Index: third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp
diff --git a/third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp b/third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp
index 39e768e42cf406eac293de8b2eb6bf38893f62ed..0c9a7b2a400b2cff8c8aa02d2c2967b749db46fd 100644
--- a/third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp
+++ b/third_party/WebKit/Source/modules/canvas2d/HitRegion.cpp
@@ -90,13 +90,13 @@ void HitRegionManager::removeAllHitRegions() {
 }
 
 HitRegion* HitRegionManager::getHitRegionById(const String& id) const {
-  return m_hitRegionIdMap.get(id);
+  return m_hitRegionIdMap.at(id);
 }
 
 HitRegion* HitRegionManager::getHitRegionByControl(
     const Element* control) const {
   if (control)
-    return m_hitRegionControlMap.get(control);
+    return m_hitRegionControlMap.at(control);
 
   return nullptr;
 }