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

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

Index: third_party/WebKit/Source/modules/webdatabase/QuotaTracker.cpp
diff --git a/third_party/WebKit/Source/modules/webdatabase/QuotaTracker.cpp b/third_party/WebKit/Source/modules/webdatabase/QuotaTracker.cpp
index e5d6598566137b705c8bc55d75e501b40423fd90..63d26c94f78acdcbbbdb449e386e831d45f34273 100644
--- a/third_party/WebKit/Source/modules/webdatabase/QuotaTracker.cpp
+++ b/third_party/WebKit/Source/modules/webdatabase/QuotaTracker.cpp
@@ -55,10 +55,10 @@ void QuotaTracker::getDatabaseSizeAndSpaceAvailableToOrigin(
     HashMap<String, SizeMap>::const_iterator it =
         m_databaseSizes.find(origin->toRawString());
     ASSERT(it->value.contains(databaseName));
-    *databaseSize = it->value.get(databaseName);
+    *databaseSize = it->value.at(databaseName);
 
     if (m_spaceAvailableToOrigins.contains(origin->toRawString())) {
-      *spaceAvailable = m_spaceAvailableToOrigins.get(origin->toRawString());
+      *spaceAvailable = m_spaceAvailableToOrigins.at(origin->toRawString());
       return;
     }
   }