[webcrypto] Add JWK import of RSA public key for NSS.

content/renderer/webcrypto/webcrypto_impl.h

Index: content/renderer/webcrypto/webcrypto_impl.h
diff --git a/content/renderer/webcrypto/webcrypto_impl.h b/content/renderer/webcrypto/webcrypto_impl.h
index c1b84a842e911202597ba35a24856f0ae9d9211a..45acd1583bfc710082b5f2015d9d81fd6d222688 100644
--- a/content/renderer/webcrypto/webcrypto_impl.h
+++ b/content/renderer/webcrypto/webcrypto_impl.h
@@ -126,6 +126,15 @@ class CONTENT_EXPORT WebCryptoImpl
       bool extractable,
       blink::WebCryptoKeyUsageMask usage_mask,
       blink::WebCryptoKey* key);
+  bool ImportRsaPublicKeyInternal(
+      const unsigned char* modulus_data,
+      unsigned modulus_size,
+      const unsigned char* exponent_data,
+      unsigned exponent_size,
+      const blink::WebCryptoAlgorithm& algorithm,
+      bool extractable,
+      blink::WebCryptoKeyUsageMask usage_mask,
+      blink::WebCryptoKey* key);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebCryptoImpl);