WebAPKs: Fix play-install variations check

chrome/browser/android/webapk/chrome_webapk_host.h

Index: chrome/browser/android/webapk/chrome_webapk_host.h
diff --git a/chrome/browser/android/webapk/chrome_webapk_host.h b/chrome/browser/android/webapk/chrome_webapk_host.h
index abc2bc7cbbb8b7eafecbf1b081a2dd8fda79dab7..dc84ea17f89f5962f4a7660446398e731274a249 100644
--- a/chrome/browser/android/webapk/chrome_webapk_host.h
+++ b/chrome/browser/android/webapk/chrome_webapk_host.h
@@ -5,12 +5,17 @@
 #ifndef CHROME_BROWSER_ANDROID_WEBAPK_CHROME_WEBAPK_HOST_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_CHROME_WEBAPK_HOST_H_
 
+#include <jni.h>
+
 #include "base/macros.h"
 
 // ChromeWebApkHost is the C++ counterpart of org.chromium.chrome.browser's
 // ChromeWebApkHost in Java.
 class ChromeWebApkHost {
  public:
+  // Registers JNI hooks.
+  static bool Register(JNIEnv* env);
+
   // Returns whether the "enalbe-webapk" is turned on.
   static bool AreWebApkEnabled();