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

third_party/WebKit/Source/core/layout/LayoutBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index a811845a856a079bf95d7ae47d63a062fccab26f..3e55ac8a94f068e9658b455e5bfabba35bf71c2c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -1318,12 +1318,11 @@ void LayoutBox::clearOverrideContainingBlockContentLogicalHeight() {
 }
 
 LayoutUnit LayoutBox::extraInlineOffset() const {
-  return gExtraInlineOffsetMap ? gExtraInlineOffsetMap->get(this)
-                               : LayoutUnit();
+  return gExtraInlineOffsetMap ? gExtraInlineOffsetMap->at(this) : LayoutUnit();
 }
 
 LayoutUnit LayoutBox::extraBlockOffset() const {
-  return gExtraBlockOffsetMap ? gExtraBlockOffsetMap->get(this) : LayoutUnit();
+  return gExtraBlockOffsetMap ? gExtraBlockOffsetMap->at(this) : LayoutUnit();
 }
 
 void LayoutBox::setExtraInlineOffset(LayoutUnit inlineOffest) {