Make ExtensionPrefs paths relative, re-enable 2 ExtensionsService unit_tests

chrome/test/data/extensions/bad/Preferences

Index: chrome/test/data/extensions/bad/Preferences
diff --git a/chrome/test/data/extensions/bad/Preferences b/chrome/test/data/extensions/bad/Preferences
new file mode 100755
index 0000000000000000000000000000000000000000..e5eb8ac8830161d4e894ab47c962d0a674dc6f77
--- /dev/null
+++ b/chrome/test/data/extensions/bad/Preferences
@@ -0,0 +1,26 @@
+{
+   "extensions": {
+      "settings": {
+         "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa": {
+            "location": 1,
+            "path": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/1",
+            "state": 1
+         },
+         "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb": {
+            "location": 1,
+            "path": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/1",
+            "state": 1
+         },
+         "bjafgdebaacbbbecmhlhpofkepfkgcpa": {
+            "location": 1,
+            "path": "bjafgdebaacbbbecmhlhpofkepfkgcpa/1.0",
+            "state": 1
+         },
+            "cccccccccccccccccccccccccccccccc": {
+            "location": 1,
+            "path": "cccccccccccccccccccccccccccccccc/1.0",
+            "state": 1
+         }
+      }
+   }
+}