Move InMemoryURLIndex outside of history namespace

chrome/browser/autocomplete/in_memory_url_index_types_unittest.cc

Index: chrome/browser/autocomplete/in_memory_url_index_types_unittest.cc
diff --git a/chrome/browser/autocomplete/in_memory_url_index_types_unittest.cc b/chrome/browser/autocomplete/in_memory_url_index_types_unittest.cc
index 59b05d510a29af80f71a94a534b7109c789c86ff..f00705b4963ca209f0778c8cefe82c75fa0e0bd8 100644
--- a/chrome/browser/autocomplete/in_memory_url_index_types_unittest.cc
+++ b/chrome/browser/autocomplete/in_memory_url_index_types_unittest.cc
@@ -12,8 +12,6 @@
 
 using base::UTF8ToUTF16;
 
-namespace history {
-
 // Helper function for verifying that the contents of a C++ iterable container
 // of ints matches a C array ints.
 template <typename T>
@@ -146,5 +144,3 @@ TEST_F(InMemoryURLIndexTypesTest, OffsetsAndTermMatches) {
   for (size_t i = 0; i < matches_b.size(); ++i)
     EXPECT_EQ(expected_offsets_b[i], matches_b[i].offset);
 }
-
-}  // namespace history