Restrict NTP fakebox ripple to P+.

Pre-P there is a problem with the ripple now growing
with the omnibox as it expands from the fakebox to the
omnibox at the top.

Limit to P+ while we investigate other solutions to
enable this on older versions.

Original CL to compare what was enabled:
https://chromium-review.googlesource.com/c/chromium/src/+/1054851/

BUG=878135

Change-Id: I2a45b398e7b67cf3a1b95aeea807485bcadc9968
Reviewed-on: https://chromium-review.googlesource.com/c/1334278Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607759}

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarPhone.java

@@ -2353,9 +2353,11 @@ public class ToolbarPhone
         if (mVisibleNewTabPage != null && mVisibleNewTabPage.isLocationBarShownInNTP()) {
             mVisibleNewTabPage.setSearchBoxScrollListener(this);
 
-            NtpSearchBoxDrawable ntpSearchBox = new NtpSearchBoxDrawable(getContext(), this);
-            mVisibleNewTabPage.setSearchBoxBackground(ntpSearchBox);
-            mActiveLocationBarBackground = ntpSearchBox;
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+                NtpSearchBoxDrawable ntpSearchBox = new NtpSearchBoxDrawable(getContext(), this);
+                mVisibleNewTabPage.setSearchBoxBackground(ntpSearchBox);
+                mActiveLocationBarBackground = ntpSearchBox;
+            }
 
             requestLayout();
         } else if (wasShowingNtp) {