Disable learning text suggestions if in incognito.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java b/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
index 027cfd201ffe8a8b67c88397aecc5734231636ea..d19ede1645145120b3f1dd75fae9bd234b5a1cd4 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/toolbar/CustomTabToolbar.java
@@ -245,6 +245,11 @@ public class CustomTabToolbar extends ToolbarLayout implements LocationBar,
     }
 
     @Override
+    public boolean allowKeyboardLearning() {
+        return !super.isIncognito();
+    }
+
+    @Override
     public boolean shouldEmphasizeHttpsScheme() {
         int securityLevel = getSecurityLevel();
         return securityLevel == ConnectionSecurityLevel.DANGEROUS