Media: do not lock the screen orientation when a video goes fullscreen on a tablet.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index f5be8d59d28b97e081294c902be760872526373b..a205f4656d6153e76aa3b6565b378c099630915f 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -85,6 +85,7 @@
 #include "net/url_request/url_request_context_getter.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/clipboard/clipboard.h"
+#include "ui/base/device_form_factor.h"
 #include "ui/base/touch/touch_device.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/animation/animation.h"
@@ -469,7 +470,8 @@ WebPreferences RenderViewHostImpl::ComputeWebkitPrefs() {
   prefs.device_supports_mouse = false;
 
   prefs.video_fullscreen_orientation_lock_enabled =
-      base::FeatureList::IsEnabled(media::kVideoFullscreenOrientationLock);
+      base::FeatureList::IsEnabled(media::kVideoFullscreenOrientationLock) &&
+      ui::GetDeviceFormFactor() == ui::DEVICE_FORM_FACTOR_PHONE;
 #endif
 
   prefs.pointer_events_max_touch_points = ui::MaxTouchPoints();