[EoS] Fix blank space on the top when shown in NoTouchActivity

Bug: 935795

Change-Id: Ifab2596ca6bea3a72fc5a8b620d71604576f3833
Reviewed-on: https://chromium-review.googlesource.com/c/1487522Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636574}

chrome/android/java/src/org/chromium/chrome/browser/native_page/BasicNativePage.java

@@ -9,7 +9,6 @@ import android.content.res.Resources;
 import android.view.View;
 import android.widget.FrameLayout.LayoutParams;
 
-import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
 import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
@@ -37,10 +36,8 @@ public abstract class BasicNativePage extends EmptyTabObserver implements Native
 
         Resources res = mActivity.getResources();
 
-        mTopMargin = 0;
         mBottomMargin = activity.getFullscreenManager().getBottomControlsHeight();
-        mTopMargin = res.getDimensionPixelSize(R.dimen.tab_strip_height)
-                + res.getDimensionPixelSize(R.dimen.toolbar_height_no_shadow);
+        mTopMargin = activity.getFullscreenManager().getTopControlsHeight();
 
         if (host.getActiveTab() != null) host.getActiveTab().addObserver(this);