Android: Suppress lint warnings in JNI generator header

We are doing some unconventional stuff in jni_generator_helper.h in
order to integrate the Chromium script with WebRTC. Long term, we will
improve this and remove the lint suppressions.

Bug: webrtc:8278
Change-Id: I5d6f0017c4deab4586844647f7cd657641fecbab
Reviewed-on: https://webrtc-review.googlesource.com/3780
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19989}

sdk/android/src/jni/jni_generator_helper.h

@@ -29,7 +29,7 @@ inline void CheckException(JNIEnv* env) {
 }
 }  // namespace jni_generator
 
-namespace {
+namespace {  // NOLINT(build/namespaces)
 // Bypass JniIntWrapper.
 // TODO(magjed): Start using Chromium's JniIntWrapper.
 typedef jint JniIntWrapper;
@@ -58,7 +58,7 @@ class JavaRef {
   T obj() const { return obj_; }
 
   // Implicit on purpose.
-  JavaRef(const T& obj) : obj_(obj) {}
+  JavaRef(const T& obj) : obj_(obj) {}  // NOLINT(runtime/explicit)
   operator T() const { return obj_; }
 
  private: