[Android] Stop checking if RegisterNativesImpl() returns >= 0.

RegisterNativesImpl() returns a bool, so the comparison was always going
to return true.

Do the reasonable thing and just rely on the function's return value
without comparing it to anything.

extensions/common/android/xwalk_extension_android.cc

@@ -219,7 +219,7 @@ static jlong GetOrCreateExtension(JNIEnv* env, jobject obj, jstring name,
 }
 
 bool RegisterXWalkExtensionAndroid(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 }  // namespace extensions

runtime/browser/android/xwalk_content.cc

@@ -413,7 +413,7 @@ static jlong Init(JNIEnv* env, jobject obj) {
 }
 
 bool RegisterXWalkContent(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 namespace {

runtime/browser/android/xwalk_contents_client_bridge.cc

@@ -470,7 +470,7 @@ void XWalkContentsClientBridge::OnReceivedIcon(const GURL& icon_url,
 }
 
 bool RegisterXWalkContentsClientBridge(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 }  // namespace xwalk

runtime/browser/android/xwalk_http_auth_handler.cc

@@ -77,7 +77,7 @@ XWalkHttpAuthHandlerBase* XWalkHttpAuthHandlerBase::Create(
 }
 
 bool RegisterXWalkHttpAuthHandler(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 }  // namespace xwalk

runtime/browser/android/xwalk_path_helper.cc

@@ -38,7 +38,7 @@ static void SetDirectory(JNIEnv* env, jclass clazz,
 }
 
 bool RegisterXWalkPathHelper(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 }  // namespace xwalk

runtime/browser/android/xwalk_settings.cc

@@ -237,7 +237,7 @@ static jstring GetDefaultUserAgent(JNIEnv* env, jclass clazz) {
 }
 
 bool RegisterXWalkSettings(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 }  // namespace xwalk

runtime/browser/android/xwalk_view_delegate.cc

@@ -19,7 +19,7 @@ jboolean IsLibraryBuiltForIA(JNIEnv* env, jclass jcaller) {
 }
 
 bool RegisterXWalkViewDelegate(JNIEnv* env) {
-  return RegisterNativesImpl(env) >= 0;
+  return RegisterNativesImpl(env);
 }
 
 }  // namespace xwalk