Fix -Wunusued-but-set-variable: /ash/wm

This CL was uploaded by git cl split.

R=minch@chromium.org

Bug: 1203071
Change-Id: I9144885a23ad3f7e53b8b517ff1c3c4c5e80179f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3216999
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Min Chen <minch@chromium.org>
Cr-Commit-Position: refs/heads/main@{#930683}

ash/wm/workspace/workspace_window_resizer.cc

@@ -1043,7 +1043,6 @@ WorkspaceWindowResizer::WorkspaceWindowResizer(
   // TODO: figure out how to deal with window going off the edge.
 
   // Calculate sizes so that we can maintain the ratios if we need to resize.
-  int total_available = 0;
   for (size_t i = 0; i < attached_windows_.size(); ++i) {
     gfx::Size min(attached_windows_[i]->delegate()
                       ? attached_windows_[i]->delegate()->GetMinimumSize()
@@ -1056,7 +1055,6 @@ WorkspaceWindowResizer::WorkspaceWindowResizer(
                             std::max(PrimaryAxisSize(min), kMinOnscreenSize));
     total_min_ += min_size;
     total_initial_size_ += initial_size;
-    total_available += std::max(min_size, initial_size) - min_size;
   }
   instance = this;