Window Placement: Reduce test popup sizes for small screens

Fixes test failures with small screen sizes (e.g. 640x480).
Hopefully a viable and simpler alternative to crrev.com/c/2454549

Bug: None
Test: On linux-chromeos: browser_tests --gtest_filter=All/PopupBrowserTest.* --ash-host-window-bounds=640x480
Change-Id: I5b7108ef295625624dbf69eaf782a3656fdebebf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454425
Auto-Submit: Michael Wasserman <msw@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814830}

chrome/browser/ui/popup_browsertest.cc

@@ -153,7 +153,7 @@ IN_PROC_BROWSER_TEST_P(PopupBrowserTest, MoveClampedToCurrentDisplay) {
   const char kOpenPopup[] =
       "open('.', '', 'left=' + (screen.availLeft + 50) + "
       "',top=' + (screen.availTop + 50) + "
-      "',width=300,height=300');";
+      "',width=150,height=100');";
   const char* const kMoveScripts[] = {
       "moveBy(screen.availWidth * 2, 0);",
       "moveBy(screen.availWidth * -2, 0);",
@@ -194,7 +194,7 @@ IN_PROC_BROWSER_TEST_P(PopupBrowserTest, ResizeClampedToCurrentDisplay) {
   const char kOpenPopup[] =
       "open('.', '', 'left=' + (screen.availLeft + 50) + "
       "',top=' + (screen.availTop + 50) + "
-      "',width=300,height=300');";
+      "',width=150,height=100');";
   // The popup cannot be resized beyond the current screen by script.
   const char* const kResizeScripts[] = {
       "resizeBy(screen.availWidth * 2, 0);",