Minor fix to README and test data file

I accidentally got the base64 <-> base64url conversion stuff wrong
in https://codereview.chromium.org/278593005/.

BUG=369895
TBR=rockot@chromium.org

Review URL: https://codereview.chromium.org/273093002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269610 0039d316-1c4b-4281-b951-d872f2087c98

extensions/test/data/content_verifier/README

@@ -8,7 +8,7 @@ openssl rsa -in private_key.pem -pubout -out public_key.pem
 The signature was generated by:
 
 1) Take the contents of payload.json and base64url encode them:
-cat payload.json | tr -d \\n | base64 -w0 | tr _ / | tr \- + | tr -d '=' > payload_encoded.txt
+cat payload.json | tr -d \\n | base64 -w0 | tr / _ | tr + \- | tr -d '=' > payload_encoded.txt
 
 2) Put the contents of payload_encoded.txt into the "payload" field of
 verified_contents.json.
@@ -22,7 +22,7 @@ echo -n '.' | cat protected.txt - payload_encoded.txt > signature_input.txt
 
 5) Sign it
 
-tr -d \\n < signature_input.txt | openssl dgst -sha256 -sign private_key.pem -binary | base64 -w0  | tr _ / | tr \- + | tr -d '=' > signature.txt
+tr -d \\n < signature_input.txt | openssl dgst -sha256 -sign private_key.pem -binary | base64 -w0  | tr / _ | tr + \- | tr -d '=' > signature.txt
 
 6) Put the contents of signature.txt into the "signature" field in
 verified_contents.json.

extensions/test/data/content_verifier/verified_contents.json

@@ -9,7 +9,7 @@
     {
       "header": {"kid": "webstore"},
       "protected": "eyJhbGciOiJSUzI1NiJ9",
-      "signature": "cLCoy+XfCahsNbF0xT6WBk2hvGwPut8D9mdkkKIDc6+wQVQryLSP2dGFqgS1XDP54vY8OqM8/7GrdTfVPim6aG80fAPd0YY3Q8nnn9zG2Lhr7rkYMMTdXFzE1bYamxoc3N9WNFkeisvXPZC26QX/D3JOlEisVhXym6DZRk3sibaVGh+mDgZej6YCzPQjnboquQsOsImL9Br7f3HxiH41kjMlsqX+PHrcgzeTVW5VOyiJVIEhOE1QDtgRPOW+MopaDPVvXxTsO8/LDeYE306CxVzemMJcKKaC39c2uOIn55cQqjOtPq1aqss7qFCSqGtvuMwmjSYEgV/q3VX/nc7npA"
+      "signature": "cLCoy-XfCahsNbF0xT6WBk2hvGwPut8D9mdkkKIDc6-wQVQryLSP2dGFqgS1XDP54vY8OqM8_7GrdTfVPim6aG80fAPd0YY3Q8nnn9zG2Lhr7rkYMMTdXFzE1bYamxoc3N9WNFkeisvXPZC26QX_D3JOlEisVhXym6DZRk3sibaVGh-mDgZej6YCzPQjnboquQsOsImL9Br7f3HxiH41kjMlsqX-PHrcgzeTVW5VOyiJVIEhOE1QDtgRPOW-MopaDPVvXxTsO8_LDeYE306CxVzemMJcKKaC39c2uOIn55cQqjOtPq1aqss7qFCSqGtvuMwmjSYEgV_q3VX_nc7npA"
     }
   ]
 }