[cr146][Android] Cleanup of unused BraveNewTabPageLayout overrides

BraveNewTabPageLayout.setSearchProviderTopMargin and
BraveNewTabPageLayout.setSearchProviderBottomMargin methods were removed at
https://github.com/brave/brave-core/commit/798973641caa39762bae9dff9d2866c7185ce6c8
but class adapter/bytecode

Chromium commit below is the commit which caused our bytecode test
to fail, because was renamed
setSearchProviderBottomMargin => setLogoViewBottomMargin .

Chromium change:
https://source.chromium.org/chromium/chromium/src/+/9b284825edfb4cea09d686dac7456517c1e8b96e

	[Composeplate] Fix composeplate view visibility issue.

	There are 3 issues of the existing NTP:
	1) When DSE is changed between Google and 3P, the return value of
	   ComposeplateUtils.isComposeplateEnabled(mIsTablet, profile)
	   changes, but we didn't recalculate it. It causes the bug that
	   composeplate view button doesn't show again for Google -> 3p ->
	   Google.
	2) If Chrome starts with 3p DSE, ComposeplateCoornidator won't be
	   initialized at all. Switching to Google won't make it visible.
	3) When switching from Google -> 3p, search box's height doesn't reduce
	   from 72dp to 64dp.

	In this CL, we resolve the above 3 issues:
	1) When DSE is changed, initialize ComposeplateCoornidator if hasn't
	   yet; updates the buttons' visibility.
	2) Changes the search box height inside NTP, not in
	   SaerchBoxContainerView. The height is determined by whether
	   composeplate is enabled, as well as whether a shadow is added.
	3) Polish the initialization process of NTP layout to prevent calling
	   same function multiple times.
	Demo: http://shortn/_vdN9koVnsu

	Bug: 474426974
	Change-Id: I3a16e56e655465d36184204657626f2bb7c92f24
	Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7487954

android/java/apk_for_test.flags

@@ -49,9 +49,6 @@
     *** mMvtContentFits;
     *** mProfile;
     *** initializeSiteSectionView(...);
-    *** setSearchProviderTopMargin(...);
-    *** setSearchProviderBottomMargin(...);
-    *** getLogoMargin(...);
     *** calculateTabletMvtWidth(...);
     *** updateMvtOnTablet(...);
     *** isInNarrowWindowOnTablet(...);