Update some content classes to content_public

Corresponds to chromium https://codereview.chromium.org/406023002/
Patch authored by ajith.v@samsung.com

Change-Id: I6da4b2afc54c8d6491726e1d6abeeeb2b83ca9db
diff --git a/chromium/java/com/android/webview/chromium/WebBackForwardListChromium.java b/chromium/java/com/android/webview/chromium/WebBackForwardListChromium.java
index ad2b64b..b584ee9 100644
--- a/chromium/java/com/android/webview/chromium/WebBackForwardListChromium.java
+++ b/chromium/java/com/android/webview/chromium/WebBackForwardListChromium.java
@@ -16,7 +16,7 @@
 
 package com.android.webview.chromium;
 
-import org.chromium.content.browser.NavigationHistory;
+import org.chromium.content_public.browser.NavigationHistory;
 
 import android.webkit.WebBackForwardList;
 import android.webkit.WebHistoryItem;
diff --git a/chromium/java/com/android/webview/chromium/WebHistoryItemChromium.java b/chromium/java/com/android/webview/chromium/WebHistoryItemChromium.java
index 18ab645..e36384b 100644
--- a/chromium/java/com/android/webview/chromium/WebHistoryItemChromium.java
+++ b/chromium/java/com/android/webview/chromium/WebHistoryItemChromium.java
@@ -16,7 +16,7 @@
 
 package com.android.webview.chromium;
 
-import org.chromium.content.browser.NavigationEntry;
+import org.chromium.content_public.browser.NavigationEntry;
 
 import android.graphics.Bitmap;
 import android.webkit.WebHistoryItem;
diff --git a/chromium/java/com/android/webview/chromium/WebViewChromium.java b/chromium/java/com/android/webview/chromium/WebViewChromium.java
index bc6bec4..763502a 100644
--- a/chromium/java/com/android/webview/chromium/WebViewChromium.java
+++ b/chromium/java/com/android/webview/chromium/WebViewChromium.java
@@ -66,7 +66,7 @@
 import org.chromium.android_webview.AwSettings;
 import org.chromium.android_webview.AwPrintDocumentAdapter;
 import org.chromium.base.ThreadUtils;
-import org.chromium.content.browser.LoadUrlParams;
+import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.net.NetworkChangeNotifier;
 
 import java.io.BufferedWriter;