Update Android Safety Tip infobar layout.

This CL converts back to the small infobar layout for Safety Tips and
updates the icon to the 'info shield'. This helps mitigate small screens
cutting off infobar titles by using the smaller-fonted layout.

It now looks like this:
https://drive.google.com/open?id=14-kCTwgzlkjjhVzVmX4hY-6YnJfynzar

Bug: 1008562
Change-Id: I1dd2809f36aea74b5d154bffa53cd601d45053fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1864289
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706709}

chrome/android/java/src/org/chromium/chrome/browser/infobar/SafetyTipInfoBar.java

@@ -55,7 +55,6 @@ public class SafetyTipInfoBar extends ConfirmInfoBar {
     @Override
     public void createContent(InfoBarLayout layout) {
         super.createContent(layout);
-        layout.setIsUsingBigIcon();
         layout.getMessageLayout().addDescription(mDescription);
     }
 }