[Explore Sites] Remove redundant char when creating Tile.

'#' will be in the json which will be parsed to get the navigation URL.
This should make things better for both server and client side.

Bug: NONE
Change-Id: I503352ab7970ed55d9e9ab3e786e3c0675d7d471
Reviewed-on: https://chromium-review.googlesource.com/1109379Reviewed-by: Cathy Li <chili@chromium.org>
Commit-Queue: Yafei Duan <romax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569123}

chrome/android/java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesCategoryTile.java

@@ -31,7 +31,7 @@ public class ExploreSitesCategoryTile {
     public ExploreSitesCategoryTile(String categoryName, String iconUrl, String navigationUrl) {
         mCategoryName = categoryName;
         mIconUrl = iconUrl;
-        mNavigationUrl = ExploreSitesBridge.nativeGetCatalogUrl() + "#" + navigationUrl;
+        mNavigationUrl = ExploreSitesBridge.nativeGetCatalogUrl() + navigationUrl;
     }
 
     public String getNavigationUrl() {