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

third_party/WebKit/Source/platform/graphics/ImageDecodingStore.cpp

Index: third_party/WebKit/Source/platform/graphics/ImageDecodingStore.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageDecodingStore.cpp b/third_party/WebKit/Source/platform/graphics/ImageDecodingStore.cpp
index 369b15b22a62b54bc824e23b1fe0b97d292dc348..126b32025f505b512b21013a4e28149df4bae9b2 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageDecodingStore.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageDecodingStore.cpp
@@ -290,7 +290,7 @@ void ImageDecodingStore::removeCacheIndexedByGeneratorInternal(
   // For each cache identifier find the corresponding CacheEntry and remove it.
   for (size_t i = 0; i < cacheIdentifierList.size(); ++i) {
     ASSERT(cacheMap->contains(cacheIdentifierList[i]));
-    const auto& cacheEntry = cacheMap->get(cacheIdentifierList[i]);
+    const auto& cacheEntry = cacheMap->at(cacheIdentifierList[i]);
     ASSERT(!cacheEntry->useCount());
     removeFromCacheInternal(cacheEntry, cacheMap, identifierMap, deletionList);
   }