content/gpu: Stop converting Rect to RectF implicitly.

This makes the conversions explicit, in the hopes of removing the
ability to do implicit int->float gfx::Rect conversions. This
patch hits the content/ and gpu/ directories.

[email protected]
BUG=342848

Review URL: https://codereview.chromium.org/1324573003

Cr-Commit-Position: refs/heads/master@{#346526}
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 684d74da..285ca7f 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -467,7 +467,7 @@
 
 gfx::Rect RenderWidget::ScreenMetricsEmulator::AdjustValidationMessageAnchor(
     const gfx::Rect& anchor) {
-  gfx::Rect scaled = gfx::ToEnclosedRect(gfx::ScaleRect(anchor, scale_));
+  gfx::Rect scaled = gfx::ScaleToEnclosedRect(anchor, scale_);
   scaled.set_x(scaled.x() + offset_.x());
   scaled.set_y(scaled.y() + offset_.y());
   return scaled;