Port "Eclipse CDT settings" file generation from GYP to GN

tools/gn/xml_element_writer_unittest.cc

Index: tools/gn/xml_element_writer_unittest.cc
diff --git a/tools/gn/xml_element_writer_unittest.cc b/tools/gn/xml_element_writer_unittest.cc
index 6702061d3c260ae3436466d17870512399d5281e..93dfd47585130b5df9fa0e443519f37da7a33458 100644
--- a/tools/gn/xml_element_writer_unittest.cc
+++ b/tools/gn/xml_element_writer_unittest.cc
@@ -24,27 +24,27 @@ class MockValueWriter {
 TEST(XmlElementWriter, EmptyElement) {
   std::ostringstream out;
   { XmlElementWriter writer(out, "foo", XmlAttributes()); }
-  EXPECT_EQ("<foo/>\n", out.str());
+  EXPECT_EQ("<foo />\n", out.str());
 
   std::ostringstream out_attr;
   {
     XmlElementWriter writer(out_attr, "foo",
                             XmlAttributes("bar", "abc").add("baz", "123"));
   }
-  EXPECT_EQ("<foo bar=\"abc\" baz=\"123\"/>\n", out_attr.str());
+  EXPECT_EQ("<foo bar=\"abc\" baz=\"123\" />\n", out_attr.str());
 
   std::ostringstream out_indent;
   {
     XmlElementWriter writer(out_indent, "foo", XmlAttributes("bar", "baz"), 2);
   }
-  EXPECT_EQ("  <foo bar=\"baz\"/>\n", out_indent.str());
+  EXPECT_EQ("  <foo bar=\"baz\" />\n", out_indent.str());
 
   std::ostringstream out_writer;
   {
     XmlElementWriter writer(out_writer, "foo", "bar", MockValueWriter("baz"),
                             2);
   }
-  EXPECT_EQ("  <foo bar=\"baz\"/>\n", out_writer.str());
+  EXPECT_EQ("  <foo bar=\"baz\" />\n", out_writer.str());
 }
 
 TEST(XmlElementWriter, ElementWithText) {
@@ -67,10 +67,10 @@ TEST(XmlElementWriter, SubElements) {
   }
   std::string expected =
       "<root aaa=\"000\">\n"
-      "  <foo/>\n"
+      "  <foo />\n"
       "  <bar bbb=\"111\">hello</bar>\n"
       "  <baz ccc=\"222\">\n"
-      "    <grandchild/>\n"
+      "    <grandchild />\n"
       "  </baz>\n"
       "</root>\n";
   EXPECT_EQ(expected, out.str());