Revert "cros-geo-apikey: Update ChromeOS surfaces to use new API keys"

This reverts commit f1341b6f55.

Reason for revert: many crashing tests when is_chrome_branded is set
b/406579271

Original change's description:
> cros-geo-apikey: Update ChromeOS surfaces to use new API keys
>
> Introduce new methods for ChromeOS to access the ChromeOS-specific GCP
> API keys. Update the `SimpleGeolocationRequest` and
> `ChromeContentBrowserClient` to use these new keys instead.
>
> Bug: 394051078
> Change-Id: I36b6995b3bfb7edd81ac63d785c0a8946101137b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6361503
> Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Commit-Queue: Zauri Meshveliani <zauri@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1438300}

Bug: 394051078, 406579271
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ie920746087812a1fd118b66031e7bd42cf8c210f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6399493
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1438546}

google_apis/google_api_keys.h

@@ -113,14 +113,6 @@ COMPONENT_EXPORT(GOOGLE_APIS) const std::string& GetFresnelAPIKey();
 
 // Retrieves the Boca API Key.
 COMPONENT_EXPORT(GOOGLE_APIS) const std::string& GetBocaAPIKey();
-
-// Retrieves the ChromeOS-specific Geolocation API Key used by the System
-// Services.
-COMPONENT_EXPORT(GOOGLE_APIS) const std::string& GetCrosSystemGeoAPIKey();
-// Retrieves the ChromeOS-specific Geolocation API Key used by the Chrome
-// browser.
-COMPONENT_EXPORT(GOOGLE_APIS) const std::string& GetCrosChromeGeoAPIKey();
-
 #endif
 
 // Retrieves the key used to sign metrics (UMA/UKM) uploads.