[CCA] Change megapixel title logic in photo resolution settings.

Bug: b/146817189
Test: Manually inspect megapixel title on different device model.
Change-Id: I7e771c52ca52b465cd7da34c90b82442cf474882
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063513
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742910}

chrome/browser/resources/chromeos/camera/src/js/views/settings.js

@@ -355,7 +355,8 @@ export class ResolutionSettings extends BaseSettings {
      * @param {!Resolution} r
      * @return {number}
      */
-    const toMegapixel = (r) => Math.round(r.area / 100000) / 10;
+    const toMegapixel = ({area}) =>
+        area >= 1e6 ? Math.round(area / 1e6) : Math.round(area / 1e5) / 10;
     const /** number */ d = gcd(r.width, r.height);
     if (resolutions.some(
             (findR) => !findR.equals(r) && r.aspectRatioEquals(findR) &&