Remove uses of base::hash_map from //chrome

chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc

Index: chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
diff --git a/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc b/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
index 0a4e9ba3f173fabe1f638eb428ed8d741002fbf6..00258b02fbfe901abc0b6bce62c7866371937e6f 100644
--- a/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
+++ b/chrome/browser/extensions/api/downloads/downloads_api_browsertest.cc
@@ -1258,9 +1258,9 @@ IN_PROC_BROWSER_TEST_F(DownloadExtensionTest,
             items[1]->GetTargetFilePath().value());
   // The order of results when orderBy is empty is unspecified. When there are
   // no sorters, DownloadQuery does not call sort(), so the order of the results
-  // depends on the order of the items in base::hash_map<uint32_t,...>
-  // DownloadManagerImpl::downloads_, which is unspecified and differs between
-  // libc++ and libstdc++. http://crbug.com/365334
+  // depends on the order of the items in DownloadManagerImpl::downloads_,
+  // which is unspecified and differs between libc++ and libstdc++.
+  // http://crbug.com/365334
 }
 
 // Test the |danger| option for search().