[gcc 4.8 build-fix] Remove duplicate line for friend declaration in print_web_view_helper.h

Compilation on linux using gcc 4.8 toolchain fails for the following duplicate statement.

FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages):
error: ‘printing::PrintWebViewHelperTest_DISABLED_OnPrintPages_Test’ is already a friend of ‘printing::PrintWebViewHelper’ [-Werror]

NOTRY=true

Review URL: https://codereview.chromium.org/553313002

Cr-Commit-Position: refs/heads/master@{#294122}

chrome/renderer/printing/print_web_view_helper.h

@@ -82,7 +82,6 @@ class PrintWebViewHelper
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperPreviewTest,
                            BlockScriptInitiatedPrinting);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages);
-  FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest, OnPrintPages);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,
                            BlockScriptInitiatedPrinting);
   FRIEND_TEST_ALL_PREFIXES(PrintWebViewHelperTest,