Fix ftp subresource deprecation message.

It has two "are"s in a row.

BUG=none

Review-Url: https://codereview.chromium.org/2976523002
Cr-Commit-Position: refs/heads/master@{#485307}

third_party/WebKit/LayoutTests/http/tests/security/contentSecurityPolicy/multiple-report-policies-expected.txt

-CONSOLE WARNING: Subresource requests using legacy protocols (like `ftp:`) are are blocked. Please deliver web-accessible resources over modern protocols like HTTPS. See https://www.chromestatus.com/feature/5709390967472128 for details.
+CONSOLE WARNING: Subresource requests using legacy protocols (like `ftp:`) are blocked. Please deliver web-accessible resources over modern protocols like HTTPS. See https://www.chromestatus.com/feature/5709390967472128 for details.
 CONSOLE ERROR: [Report Only] Refused to load the image 'ftp://blah.test/' because it violates the following Content Security Policy directive: "img-src http://* https://*".
 
 PingLoader dispatched to 'http://127.0.0.1:8000/security/contentSecurityPolicy/resources/save-report.php?test=multiple-report-policies-1'.

third_party/WebKit/LayoutTests/http/tests/security/deprecated-subresource-requests-expected.txt

-CONSOLE WARNING: Subresource requests using legacy protocols (like `ftp:`) are are blocked. Please deliver web-accessible resources over modern protocols like HTTPS. See https://www.chromestatus.com/feature/5709390967472128 for details.
+CONSOLE WARNING: Subresource requests using legacy protocols (like `ftp:`) are blocked. Please deliver web-accessible resources over modern protocols like HTTPS. See https://www.chromestatus.com/feature/5709390967472128 for details.
 CONSOLE WARNING: Subresource requests whose URLs contain embedded credentials (e.g. `https://user:pass@host/`) are blocked. See https://www.chromestatus.com/feature/5669008342777856 for more details.
 This is a testharness.js-based test.
 PASS Untitled 

third_party/WebKit/LayoutTests/security/block-test-expected.txt

@@ -131,7 +131,7 @@ CONSOLE MESSAGE: line 32: PASS: error event fired for http://255.255.255.255:655
 CONSOLE MESSAGE: line 32: PASS: error event fired for http://255.255.255.255:65536/test.jpg
 CONSOLE MESSAGE: line 32: PASS: error event fired for http://255.255.255.255:4294967295/test.jpg
 CONSOLE MESSAGE: line 32: PASS: error event fired for http://255.255.255.255:4294967296/test.jpg
-CONSOLE WARNING: Subresource requests using legacy protocols (like `ftp:`) are are blocked. Please deliver web-accessible resources over modern protocols like HTTPS. See https://www.chromestatus.com/feature/5709390967472128 for details.
+CONSOLE WARNING: Subresource requests using legacy protocols (like `ftp:`) are blocked. Please deliver web-accessible resources over modern protocols like HTTPS. See https://www.chromestatus.com/feature/5709390967472128 for details.
 CONSOLE MESSAGE: line 32: PASS: error event fired for ftp://255.255.255.255/test.jpg
 CONSOLE MESSAGE: line 32: PASS: error event fired for ftp://255.255.255.255:21/test.jpg
 CONSOLE MESSAGE: line 32: PASS: error event fired for ftp://255.255.255.255:22/test.jpg

third_party/WebKit/Source/core/frame/Deprecation.cpp

@@ -252,7 +252,7 @@ String Deprecation::DeprecationMessage(WebFeature feature) {
     case WebFeature::kLegacyProtocolEmbeddedAsSubresource:
       return String::Format(
           "Subresource requests using legacy protocols (like `ftp:`) are "
-          "are blocked. Please deliver web-accessible resources over modern "
+          "blocked. Please deliver web-accessible resources over modern "
           "protocols like HTTPS. See "
           "https://www.chromestatus.com/feature/5709390967472128 for details.");