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

third_party/WebKit/Source/modules/webdatabase/DatabaseManager.cpp

Index: third_party/WebKit/Source/modules/webdatabase/DatabaseManager.cpp
diff --git a/third_party/WebKit/Source/modules/webdatabase/DatabaseManager.cpp b/third_party/WebKit/Source/modules/webdatabase/DatabaseManager.cpp
index 6ded8df0b5b95539474e5ff8fd99516be22efed4..5d8a7cce1fff5cfa7a5a45780e3563a739887087 100644
--- a/third_party/WebKit/Source/modules/webdatabase/DatabaseManager.cpp
+++ b/third_party/WebKit/Source/modules/webdatabase/DatabaseManager.cpp
@@ -73,7 +73,7 @@ DatabaseContext* DatabaseManager::existingDatabaseContextFor(
   ASSERT(m_databaseContextRegisteredCount >= 0);
   ASSERT(m_databaseContextInstanceCount >= 0);
   ASSERT(m_databaseContextRegisteredCount <= m_databaseContextInstanceCount);
-  return m_contextMap.get(context);
+  return m_contextMap.at(context);
 }
 
 DatabaseContext* DatabaseManager::databaseContextFor(
@@ -95,7 +95,7 @@ void DatabaseManager::registerDatabaseContext(
 void DatabaseManager::unregisterDatabaseContext(
     DatabaseContext* databaseContext) {
   ExecutionContext* context = databaseContext->getExecutionContext();
-  ASSERT(m_contextMap.get(context));
+  ASSERT(m_contextMap.at(context));
 #if DCHECK_IS_ON()
   m_databaseContextRegisteredCount--;
 #endif