Make EarlGrey matchers compliant with Chromium style.

ios/chrome/browser/ui/first_run/first_run_egtest.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <EarlGrey/EarlGrey.h>
 #import <XCTest/XCTest.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/metrics/metrics_pref_names.h"
@@ skipping 23 matching lines @@
 
 // Returns a fake identity.
 ChromeIdentity* GetFakeIdentity() {
   return [FakeChromeIdentity identityWithEmail:@"foo@gmail.com"
                                         gaiaID:@"fooID"
                                           name:@"Fake Foo"];
 }
 
 // Taps the button with accessibility labelId |message_id|.
 void TapButtonWithLabelId(int message_id) {
-  id<GREYMatcher> matcher = chrome_test_util::buttonWithAccessibilityLabel(
+  id<GREYMatcher> matcher = chrome_test_util::ButtonWithAccessibilityLabel(
       l10n_util::GetNSString(message_id));
   [[EarlGrey selectElementWithMatcher:matcher] performAction:grey_tap()];
 }
 
 // Asserts that |identity| is actually signed in to the active profile.
 void AssertAuthenticatedIdentityInActiveProfile(ChromeIdentity* identity) {
   [[GREYUIThreadExecutor sharedInstance] drainUntilIdle];
 
   ios::ChromeBrowserState* browser_state =
       chrome_test_util::GetOriginalBrowserState();
@@ skipping 69 matching lines @@
 }
 
 // Toggle the UMA checkbox.
 - (void)testToggleMetricsOn {
   [chrome_test_util::GetMainController() showFirstRunUI];
 
   id<GREYMatcher> metrics =
       grey_accessibilityID(kUMAMetricsButtonAccessibilityIdentifier);
   [[EarlGrey selectElementWithMatcher:metrics] performAction:grey_tap()];
 
-  id<GREYMatcher> optInAccept = chrome_test_util::buttonWithAccessibilityLabel(
+  id<GREYMatcher> optInAccept = chrome_test_util::ButtonWithAccessibilityLabel(
       l10n_util::GetNSString(IDS_IOS_FIRSTRUN_OPT_IN_ACCEPT_BUTTON));
   [[EarlGrey selectElementWithMatcher:optInAccept] performAction:grey_tap()];
 
   BOOL metricsOptIn = GetApplicationContext()->GetLocalState()->GetBoolean(
       metrics::prefs::kMetricsReportingEnabled);
   GREYAssert(
       metricsOptIn != [WelcomeToChromeViewController defaultStatsCheckboxValue],
       @"Metrics reporting pref is incorrect.");
 }
 
 // Dismisses the first run screens.
 - (void)testDismissFirstRun {
   [chrome_test_util::GetMainController() showFirstRunUI];
 
-  id<GREYMatcher> optInAccept = chrome_test_util::buttonWithAccessibilityLabel(
+  id<GREYMatcher> optInAccept = chrome_test_util::ButtonWithAccessibilityLabel(
       l10n_util::GetNSString(IDS_IOS_FIRSTRUN_OPT_IN_ACCEPT_BUTTON));
   [[EarlGrey selectElementWithMatcher:optInAccept] performAction:grey_tap()];
 
   PrefService* preferences = GetApplicationContext()->GetLocalState();
   GREYAssert(
       preferences->GetBoolean(metrics::prefs::kMetricsReportingEnabled) ==
           [WelcomeToChromeViewController defaultStatsCheckboxValue],
       @"Metrics reporting does not match.");
 
   id<GREYMatcher> skipSignIn =
@@ skipping 55 matching lines @@
                   @"Sync shouldn't have finished its original setup yet");
 
   // Close Settings, user is still signed in and sync is now starting.
   TapButtonWithLabelId(IDS_IOS_NAVIGATION_BAR_DONE_BUTTON);
   AssertAuthenticatedIdentityInActiveProfile(identity);
   GREYAssertTrue(sync_service->HasFinishedInitialSetup(),
                  @"Sync should have finished its original setup");
 }
 
 @end