DevTools: [Persistence] implement automapping

third_party/WebKit/LayoutTests/http/tests/inspector/persistence/automapping-sane-expected.txt

+Verify that automapping is sane.
+
+Binding created: {
+       network: http://example.com
+    fileSystem: file:///var/www/index.html
+    exactMatch: true
+}
+Binding created: {
+       network: http://example.com/path/foo.js
+    fileSystem: file:///var/www/scripts/foo.js
+    exactMatch: true
+}
+Binding created: {
+       network: http://example.com/bar.css?12341234
+    fileSystem: file:///var/www/styles/bar.css
+    exactMatch: true
+}
+Mapping has stabilized.
+