Change JS parameter to camel case.

Changes the parameter default_zoom_factor to appear as defaultZoomFactor
to javascript.

BUG=477559

Review URL: https://codereview.chromium.org/1093603002

Cr-Commit-Position: refs/heads/master@{#325477}

chrome/browser/extensions/api/tabs/tabs_test.cc

@@ -792,7 +792,7 @@ testing::AssertionResult ExtensionTabsZoomTest::RunGetDefaultZoom(
   if (!get_zoom_settings_result)
     return testing::AssertionFailure() << "no result";
 
-  if (!get_zoom_settings_result->GetDouble("default_zoom_factor",
+  if (!get_zoom_settings_result->GetDouble("defaultZoomFactor",
                                            default_zoom_factor)) {
     return testing::AssertionFailure()
            << "default zoom factor not found in result";

chrome/common/extensions/api/tabs.json

@@ -79,9 +79,8 @@
             "description": "Defines whether zoom changes will persist for the page's origin, or only take effect in this tab; defaults to <code>per-origin</code> when in <code>automatic</code> mode, and <code>per-tab</code> otherwise.",
             "optional": true
           },
-          "default_zoom_factor": {
+          "defaultZoomFactor": {
             "type": "number",
-            "name": "defaultZoomFactor",
             "optional": true,
             "description": "Used to return the default zoom level for the current tab in calls to tabs.getZoomSettings."
           }

chrome/common/extensions/docs/examples/api/tabs/zoom/popup.js

@@ -51,7 +51,7 @@ document.addEventListener('DOMContentLoaded', function() {
       }
 
       var percentDefaultZoom =
-          parseFloat(zoomSettings.default_zoom_factor) * 100;
+          parseFloat(zoomSettings.defaultZoomFactor) * 100;
       document.getElementById('defaultLabel').textContent =
           'Default: ' + percentDefaultZoom.toFixed(1) + '%';
     });