Omit protocol part in URLs in changelog pages.

Reason for this change:
In the past, build.chromium.org was HTTP-only, and so it couldn't be directly put in an iframe on the perf dashboard which uses HTTPS. Annie Sullivan made a page on the perf dashboard, /revision_proxy to get around this.

Now, build.chromium.org supports HTTPS, and I wanted to switch the changelog viewer links that the dashboard uses to HTTPS. The purpose of this CL is to make the changelog viewer pages work the same with both HTTP and HTTPS.

BUG=

Review URL: https://codereview.chromium.org/148963013

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/perf@248779 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/dashboard/ui/changelog.html b/dashboard/ui/changelog.html
index ea6f3c5..4cced7a 100644
--- a/dashboard/ui/changelog.html
+++ b/dashboard/ui/changelog.html
@@ -58,8 +58,8 @@
 </form>
 
 <script>
-var svnRootUrl = "http://src.chromium.org/svn/";
-var viewVc = "http://src.chromium.org/viewvc/chrome";
+var svnRootUrl = "//src.chromium.org/svn/";
+var viewVc = "//src.chromium.org/viewvc/chrome";
 
 params = ParseParams();
 var svnPath = params["url"];
diff --git a/dashboard/ui/changelog_blink.html b/dashboard/ui/changelog_blink.html
index 5e62695..9c8ef67 100644
--- a/dashboard/ui/changelog_blink.html
+++ b/dashboard/ui/changelog_blink.html
@@ -59,8 +59,8 @@
 </form>
 
 <script>
-var svnRootUrl = "http://src.chromium.org/blink/";
-var viewVc = "http://src.chromium.org/viewvc/blink";
+var svnRootUrl = "//src.chromium.org/blink/";
+var viewVc = "//src.chromium.org/viewvc/blink";
 
 params = ParseParams();
 var svnPath = params["url"];
diff --git a/dashboard/ui/changelog_v8.html b/dashboard/ui/changelog_v8.html
index 61ec291..42da5c9 100644
--- a/dashboard/ui/changelog_v8.html
+++ b/dashboard/ui/changelog_v8.html
@@ -58,7 +58,7 @@
 </form>
 
 <script>
-var svnRootUrl = "http://v8.googlecode.com/svn/";
+var svnRootUrl = "//v8.googlecode.com/svn/";
 
 // Unfortunately V8 doesn't have a ViewVC for the Subversion repo:
 var viewVc = "";
diff --git a/dashboard/ui/changelog_webrtc.html b/dashboard/ui/changelog_webrtc.html
index 6f9626c..a636d0f 100644
--- a/dashboard/ui/changelog_webrtc.html
+++ b/dashboard/ui/changelog_webrtc.html
@@ -58,7 +58,7 @@
 </form>
 
 <script>
-var svnRootUrl = "http://webrtc.googlecode.com/svn/";
+var svnRootUrl = "//webrtc.googlecode.com/svn/";
 
 // Unfortunately WebRTC doesn't have a ViewVC for the Subversion repo:
 var viewVc = "";
diff --git a/dashboard/ui/js/changelog.js b/dashboard/ui/js/changelog.js
index 315e963..630de0a 100644
--- a/dashboard/ui/js/changelog.js
+++ b/dashboard/ui/js/changelog.js
@@ -145,7 +145,7 @@
     return;
   gViewvcUrl = viewvcUrl;
 
-  var url = "http://" + location.host + "/cgi-bin/svn-log?url=" +
+  var url = "//" + location.host + "/cgi-bin/svn-log?url=" +
       svnRootUrl + unescape(svnPath) + "&range=" + unescape(svnRange);
 
   // global 'gContent' variable: a hidden iframe used to fetch svn data.