Cleanup content:: prefixes in GuestView files.

extensions/browser/guest_view/extension_view/extension_view_guest.cc

Index: extensions/browser/guest_view/extension_view/extension_view_guest.cc
diff --git a/extensions/browser/guest_view/extension_view/extension_view_guest.cc b/extensions/browser/guest_view/extension_view/extension_view_guest.cc
index 101f3534abfffe790acc7282336cb409bdb535af..e000d6e2b63f315a7c41bb31f06085f32ef7841e 100644
--- a/extensions/browser/guest_view/extension_view/extension_view_guest.cc
+++ b/extensions/browser/guest_view/extension_view/extension_view_guest.cc
@@ -25,17 +25,14 @@ namespace extensions {
 // static
 const char ExtensionViewGuest::Type[] = "extensionview";
 
-ExtensionViewGuest::ExtensionViewGuest(
-    content::WebContents* owner_web_contents)
-    : GuestView<ExtensionViewGuest>(owner_web_contents) {
-}
+ExtensionViewGuest::ExtensionViewGuest(WebContents* owner_web_contents)
+    : GuestView<ExtensionViewGuest>(owner_web_contents) {}
 
 ExtensionViewGuest::~ExtensionViewGuest() {
 }
 
 // static
-GuestViewBase* ExtensionViewGuest::Create(
-    content::WebContents* owner_web_contents) {
+GuestViewBase* ExtensionViewGuest::Create(WebContents* owner_web_contents) {
   return new ExtensionViewGuest(owner_web_contents);
 }
 
@@ -116,7 +113,6 @@ int ExtensionViewGuest::GetTaskPrefix() const {
   return IDS_EXTENSION_TASK_MANAGER_EXTENSIONVIEW_TAG_PREFIX;
 }
 
-// content::WebContentsObserver implementation.
 void ExtensionViewGuest::DidCommitProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& url,