[ios] Fix ios/c/b/ui/table_view chevron assets and use new history icon.

Original assets had white backgrounds. These have transparent ones. Also uses the new history asset in Recent Tabs.

Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ibbdcff9a87cc3b93a59710736fa1b82f1b246efb
Reviewed-on: https://chromium-review.googlesource.com/999294
Commit-Queue: Chris Lu <thegreenfrog@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548836}

ios/chrome/browser/ui/recent_tabs/BUILD.gn

@@ -12,6 +12,7 @@ source_set("recent_tabs") {
   ]
   deps = [
     ":recent_tabs_ui",
+    "resources:show_history",
     "//base",
     "//components/browser_sync",
     "//components/sessions",

ios/chrome/browser/ui/recent_tabs/recent_tabs_table_view_controller.mm

@@ -192,7 +192,7 @@ const int kRelativeTimeMaxHours = 4;
   TableViewURLItem* historyItem =
       [[TableViewURLItem alloc] initWithType:ItemTypeShowFullHistory];
   historyItem.title = l10n_util::GetNSString(IDS_HISTORY_SHOWFULLHISTORY_LINK);
-  historyItem.favicon = [UIImage imageNamed:@"ntp_opentabs_clock"];
+  historyItem.favicon = [UIImage imageNamed:@"show_history"];
   [model addItem:historyItem
       toSectionWithIdentifier:SectionIdentifierRecentlyClosedTabs];
 }