Fix client certificate regressions on Android < 4.2

net/android/java/src/org/chromium/net/DefaultAndroidKeyStore.java

Index: net/android/java/src/org/chromium/net/DefaultAndroidKeyStore.java
diff --git a/net/android/java/src/org/chromium/net/DefaultAndroidKeyStore.java b/net/android/java/src/org/chromium/net/DefaultAndroidKeyStore.java
index cc6165772c1d29787e842371cdac75103480aa3c..2492da6befc35b8f761bb463d550a62f08493ae2 100644
--- a/net/android/java/src/org/chromium/net/DefaultAndroidKeyStore.java
+++ b/net/android/java/src/org/chromium/net/DefaultAndroidKeyStore.java
@@ -167,7 +167,7 @@ public class DefaultAndroidKeyStore implements AndroidKeyStore {
             Log.e(TAG, "Cannot find system OpenSSLRSAPrivateKey class: " + e);
             return 0;
         }
-        if (!superClass.isInstance(key)) {
+        if (!superClass.isInstance(javaKey)) {
             // This may happen if the PrivateKey was not created by the "AndroidOpenSSL"
             // provider, which should be the default. That could happen if an OEM decided
             // to implement a different default provider. Also highly unlikely.
@@ -197,7 +197,11 @@ public class DefaultAndroidKeyStore implements AndroidKeyStore {
 
             // Use reflection to invoke the 'getPkeyContext' method on the
             // result of the getOpenSSLKey(). This is an 32-bit integer
-            // which is the address of an EVP_PKEY object.
+            // which is the address of an EVP_PKEY object. Note that this
+            // method these days returns a 64-bit long, but since this code
+            // path is used for older Android versions, it may still return
+            // a 32-bit int here. To be on the safe side, we cast the return
+            // value via Number rather than directly to Integer or Long.
             Method getPkeyContext;
             try {
                 getPkeyContext = opensslKey.getClass().getDeclaredMethod("getPkeyContext");
@@ -209,7 +213,7 @@ public class DefaultAndroidKeyStore implements AndroidKeyStore {
             getPkeyContext.setAccessible(true);
             long evp_pkey = 0;
             try {
-                evp_pkey = (Long) getPkeyContext.invoke(opensslKey);
+                evp_pkey = ((Number) getPkeyContext.invoke(opensslKey)).longValue();
             } finally {
                 getPkeyContext.setAccessible(false);
             }