Prefer jinja2 from third_party over system library in process_resources.py

Make sure jinja2 from third_party is used.

Review URL: https://codereview.chromium.org/1138383003

Cr-Commit-Position: refs/heads/master@{#330341}

build/android/gyp/process_resources.py

@@ -23,7 +23,8 @@ import generate_v14_compatible_resources
 from util import build_utils
 
 # Import jinja2 from third_party/jinja2
-sys.path.append(os.path.join(os.path.dirname(__file__), '../../../third_party'))
+sys.path.insert(1,
+    os.path.join(os.path.dirname(__file__), '../../../third_party'))
 from jinja2 import Template # pylint: disable=F0401