bug(EJ2-5450): Tab header className change.

Author: pipeline

src/tab/default-plnkr.json

@@ -3,7 +3,7 @@
         This sample demonstrates the default functionalities of the <code>Tab</code>. Click on the <code>header</code>  element to activate the corresponding Tab, and displays its <code>content</code>.
     </p>
 </div>
-<div class="control-section">
+<div class="control-section e-tab-section">
     <div class="e-sample-resize-container">
         <!-- Render the Tab Component -->
         <ej-tab id="tab_default" heightAdjustMode='Auto'>

src/tab/default.html

@@ -3,7 +3,7 @@
         This sample demonstrates the <code>header</code> orientation of the <code>Tab</code>. Select option from drop-downs to switch header placement and changing the header style in properties panel.
     </p>
 </div>
-<div class="control-section">
+<div class="control-section e-tab-section">
     <div class="col-lg-8 content-wrapper">
         <!-- Render the Tab Component -->
         <ej-tab id="tab_orientation" #orientationTab [showCloseButton]='enableClose' heightAdjustMode='Auto'>

src/tab/orientation-plnkr.json

@@ -3,7 +3,7 @@
         This sample demonstrates both <code>scrollable</code> and <code>popup</code> modes of the <code>Tab</code>. Select option from down-down to change the responsive option in property panel.
     </p>
 </div>
-<div class="control-section">
+<div class="control-section e-tab-section">
     <div class="col-lg-8 content-wrapper">
         <div class="e-sample-resize-container">
             <!-- Render the Tab Component -->

src/tab/orientation.html

@@ -3,7 +3,7 @@
         This sample demonstrates the RTL mode of the <code>Tab</code>. Click on the <code>header</code> element for activate the corresponding tab, and displays its <code>content</code> with right-to-left direction.
     </p>
 </div>
-<div class="control-section">
+<div class="control-section e-tab-section">
     <div class="e-sample-resize-container">
         <!-- Render the Tab Component -->
         <ej-tab id="tab_rtl" enableRtl='true' heightAdjustMode='Auto'>

src/tab/responsivemodes-plnkr.json

@@ -1,6 +1,5 @@
 import { NgModule, ModuleWithProviders, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
 import { RouterModule } from '@angular/router';
-import { TabModule } from '@syncfusion/ej2-ng-navigations';
 import { DefaultTabComponent } from './default.component';
 import { OrientationTabComponent } from './orientation.component';
 import { ResponsiveTabComponent } from './responsivemodes.component';
@@ -17,7 +16,7 @@ export const tabAppRoutes: Object[] = [
 export const tabRouter: ModuleWithProviders = RouterModule.forChild(tabAppRoutes);
 
 @NgModule({
-    imports: [tabRouter, TabModule, SharedModule],
+    imports: [tabRouter, SharedModule],
     declarations: [
         DefaultTabComponent,
         OrientationTabComponent,