Add constructors to WebInputEvents and setters so we can work at cleaning up these public structs.

chrome/browser/download/download_browsertest.cc

Index: chrome/browser/download/download_browsertest.cc
diff --git a/chrome/browser/download/download_browsertest.cc b/chrome/browser/download/download_browsertest.cc
index e6aa494a9d605776d517d7e0194365e4bd59b954..954d03c1f0e500aa7874ed7741e8c27dca1fd0be 100644
--- a/chrome/browser/download/download_browsertest.cc
+++ b/chrome/browser/download/download_browsertest.cc
@@ -2621,15 +2621,15 @@ IN_PROC_BROWSER_TEST_F(DownloadTest, LoadURLExternallyReferrerPolicy) {
   // Click on the link with the alt key pressed. This will download the link
   // target.
   WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
-  blink::WebMouseEvent mouse_event;
-  mouse_event.type = blink::WebInputEvent::MouseDown;
+  blink::WebMouseEvent mouse_event(blink::WebInputEvent::MouseDown,
+                                   blink::WebInputEvent::AltKey,
+                                   blink::WebInputEvent::TimeStampForTesting);
   mouse_event.button = blink::WebMouseEvent::Button::Left;
   mouse_event.x = 15;
   mouse_event.y = 15;
   mouse_event.clickCount = 1;
-  mouse_event.modifiers = blink::WebInputEvent::AltKey;
   tab->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(mouse_event);
-  mouse_event.type = blink::WebInputEvent::MouseUp;
+  mouse_event.setType(blink::WebInputEvent::MouseUp);
   tab->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(mouse_event);
 
   waiter->WaitForFinished();
@@ -2678,14 +2678,15 @@ IN_PROC_BROWSER_TEST_F(DownloadTest, SaveLinkAsReferrerPolicyOrigin) {
       IDC_CONTENT_CONTEXT_SAVELINKAS);
 
   WebContents* tab = browser()->tab_strip_model()->GetActiveWebContents();
-  blink::WebMouseEvent mouse_event;
-  mouse_event.type = blink::WebInputEvent::MouseDown;
+  blink::WebMouseEvent mouse_event(blink::WebInputEvent::MouseDown,
+                                   blink::WebInputEvent::NoModifiers,
+                                   blink::WebInputEvent::TimeStampForTesting);
   mouse_event.button = blink::WebMouseEvent::Button::Right;
   mouse_event.x = 15;
   mouse_event.y = 15;
   mouse_event.clickCount = 1;
   tab->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(mouse_event);
-  mouse_event.type = blink::WebInputEvent::MouseUp;
+  mouse_event.setType(blink::WebInputEvent::MouseUp);
   tab->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(mouse_event);
 
   waiter->WaitForFinished();