[Crash fix] Create mActionModeControllerCallback in the constructor

This field was being set in initializeToolbar() and used in
initFindToolbarManager(). onInflationComplete() calls these methods
in a reverse order.

Bug: 1116924
Change-Id: I1899db0c9b572f3386cfe3ac480111b673c1c28c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360573
Commit-Queue: who/bttk <bttk@chromium.org>
Reviewed-by: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798891}

chrome/android/java/src/org/chromium/chrome/browser/ui/RootUiCoordinator.java

@@ -138,7 +138,7 @@ public class RootUiCoordinator
     private List<ButtonDataProvider> mButtonDataProviders;
     private IdentityDiscController mIdentityDiscController;
     private ChromeActionModeHandler mChromeActionModeHandler;
-    private ToolbarActionModeCallback mActionModeControllerCallback;
+    private final ToolbarActionModeCallback mActionModeControllerCallback;
     private ObservableSupplierImpl<Boolean> mOmniboxFocusStateSupplier =
             new ObservableSupplierImpl<>();
     protected final ObservableSupplier<Profile> mProfileSupplier;
@@ -191,6 +191,7 @@ public class RootUiCoordinator
         mBookmarkBridgeSupplier = bookmarkBridgeSupplier;
         mAppMenuSupplier = new ObservableSupplierImpl<>();
         mContextualSearchManagerSupplier = contextualSearchManagerSupplier;
+        mActionModeControllerCallback = new ToolbarActionModeCallback();
 
         mOmniboxFocusStateSupplier.set(false);
 
@@ -509,7 +510,6 @@ public class RootUiCoordinator
                     bottomToolbarVisibilitySupplier, mActivity.getLifecycleDispatcher(),
                     mActivity.getModalDialogManager());
             mButtonDataProviders = Arrays.asList(mIdentityDiscController, shareButtonController);
-            mActionModeControllerCallback = new ToolbarActionModeCallback();
             mToolbarManager = new ToolbarManager(mActivity, mActivity.getBrowserControlsManager(),
                     mActivity.getFullscreenManager(), toolbarContainer,
                     mActivity.getCompositorViewHolder().getInvalidator(), urlFocusChangedCallback,