[about:omnibox]: fix url for transition header

On the about:omnibox page, the transition table-header is a hyperlink to the relevant code segment explaining page transitions. This cl fixes that link.
Previous broken link: http://code.google.com/codesearch#OAMlx_jo-ck/src/content/public/common/page_transition_types.h&exact_package=chromium&l=24
New link: https://cs.chromium.org/chromium/src/ui/base/page_transition_types.h?q=page_transition_types.h&sq=package:chromium&dr=CSs&l=14

Change-Id: I75512d5d6b5420396f8ee22271798c365e4c6c90
Reviewed-on: https://chromium-review.googlesource.com/1252010Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595485}

chrome/browser/resources/omnibox/omnibox.js

@@ -154,8 +154,8 @@
     new PresentationInfoRecord('Prev', '', 'fromPrevious', false, ''),
     new PresentationInfoRecord(
         'Tran',
-        'http://code.google.com/codesearch#OAMlx_jo-ck/src/content/public/' +
-        'common/page_transition_types.h&exact_package=chromium&l=24',
+        'https://cs.chromium.org/chromium/src/ui/base/page_transition_types.h' +
+        '?q=page_transition_types.h&sq=package:chromium&dr=CSs&l=14',
         'transition', false, 'How the user got to the result.'),
     new PresentationInfoRecord(
         'Done', '', 'providerDone', false,