Use correct width in Cast-related dialogs

Subtract margin width from the preferred widths of the media remoting
and cloud services dialogs, so that they have the intended width.

Bug: 875102
Change-Id: I362dd2bbae7f533df3f9f51d851c7f7b5d136908
Reviewed-on: https://chromium-review.googlesource.com/1187577Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585896}

chrome/browser/ui/views/media_router/cloud_services_dialog_view.cc

@@ -102,7 +102,8 @@ bool CloudServicesDialogView::Cancel() {
 
 gfx::Size CloudServicesDialogView::CalculatePreferredSize() const {
   const int width = ChromeLayoutProvider::Get()->GetDistanceMetric(
-      DISTANCE_BUBBLE_PREFERRED_WIDTH);
+                        DISTANCE_BUBBLE_PREFERRED_WIDTH) -
+                    margins().width();
   return gfx::Size(width, GetHeightForWidth(width));
 }
 

chrome/browser/ui/views/media_router/media_remoting_dialog_view.cc

@@ -106,7 +106,8 @@ bool MediaRemotingDialogView::Close() {
 
 gfx::Size MediaRemotingDialogView::CalculatePreferredSize() const {
   const int width = ChromeLayoutProvider::Get()->GetDistanceMetric(
-      DISTANCE_BUBBLE_PREFERRED_WIDTH);
+                        DISTANCE_BUBBLE_PREFERRED_WIDTH) -
+                    margins().width();
   return gfx::Size(width, GetHeightForWidth(width));
 }