Bug 64419 Tomcat example does not need "web app root" attribute
The Tomcat/JSP launching example currently requires the user specify a "web app root" on the main tab. However, all we need is the project (in order to compute a classpath for extra java files and source lookup path). We used to require the attribute for source lookup.
org.eclipse.jdt.ui.examples.javafamily/src/org/eclipse/jsp/launching/TomcatTab.java
fTomcatDir.setFont(font);
		fTomcatDir.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent evt) {
				updateLaunchConfigurationDialog();
			}
		});
		
		fBrowseButton = createPushButton(composite, LaunchingMessages.getString("TomcatTab.21"), null); 
		fBrowseButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent evt) {
				handleTomcatBrowseButtonSelected();
			}
		});
		
		createVerticalSpacer(composite, 3);
		
		label = new Label(composite, SWT.NONE);
		label.setText(LaunchingMessages.getString("TomcatTab.22")); 
		gd = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING);
		gd.horizontalSpan = 3;
		label.setLayoutData(gd);
		label.setFont(font);
				
		fWebAppDir = new Text(composite, SWT.SINGLE | SWT.BORDER);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.horizontalSpan = 2;
		fWebAppDir.setLayoutData(gd);
		fWebAppDir.setFont(font);
		fWebAppDir.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent evt) {