fix a few bugs in the studio download button behavior:

- make button text always white (avoid blue on blue during hover)
 - revise logic to add the platform name to download button to avoid weird duplicity bug on small screens
 - remove the animation script when clicking download before agree because it reloaded the page (unkown cause)
depends on: https://googleplex-android-review.git.corp.google.com/#/c/752757/

Change-Id: I1b2b4ff9c0b0cbbd34f1c77a2b736fe3425a16e4

tools/droiddoc/templates-sdk/assets/css/default.css

@@ -6362,7 +6362,7 @@ div.jd-descr > .resource-widget[data-section=distribute\/tools] .section-card-me
 .dac-button.dac-raised.dac-primary, .landing-secondary, .button {
   background-color: #039bef; }
   .dac-button.dac-raised.dac-primary:hover, .landing-secondary:hover, .button:hover {
-    background-color: #0288d1; }
+    background-color: #0288d1; color:#fff; }
   .dac-button.dac-raised.dac-primary:active, .landing-secondary:active, .button:active {
     background-color: #0277bd; }
 

tools/droiddoc/templates-sdk/sdkpage.cs

@@ -404,6 +404,7 @@ var:sdk.linux_download
 
 
 <script>
+
   if (location.hash == "#Requirements") {
     $('.reqs').show();
   } else if (location.hash == "#ExistingIDE") {
@@ -434,7 +435,7 @@ var:sdk.linux_download
     $('#not-supported').hide();
 
     /* set up primary Android Studio download button */
-    $('.download-bundle-button').append(" <br/><span class='small'>for " + os + "</span>");
+    $('.download-bundle-button > .small').html(" for " + os);
     $('.download-bundle-button').click(function() {return onDownload(this,true,true);}).attr('href', bundlename);
   }
 
@@ -501,9 +502,6 @@ var:sdk.linux_download
       ga('send', 'event', 'SDK', 'IDE and Tools', $("#downloadForRealz").html());
       return true;
     } else {
-      $("label#agreeLabel").parent().stop().animate({color: "#258AAF"}, 200,
-        function() {$("label#agreeLabel").parent().stop().animate({color: "#222"}, 200)}
-      );
       return false;
     }
   }