Make EarlGrey matchers compliant with Chromium style.

ios/testing/earl_grey/matchers.h

Index: ios/testing/earl_grey/matchers.h
diff --git a/ios/testing/earl_grey/matchers.h b/ios/testing/earl_grey/matchers.h
index fe408104b1d88fdb20e7d608e9fca10cd74ba683..5cb0bdcd37846d0197b57e936ad771ceecb9064c 100644
--- a/ios/testing/earl_grey/matchers.h
+++ b/ios/testing/earl_grey/matchers.h
@@ -12,7 +12,7 @@
 namespace testing {
 
 // Matcher for context menu item whose text is exactly |text|.
-id<GREYMatcher> contextMenuItemWithText(NSString* text);
+id<GREYMatcher> ContextMenuItemWithText(NSString* text);
 
 // Matcher for a UI element to tap to dismiss the the context menu, where
 // |cancel_text| is the localized text used for the action sheet cancel control.
@@ -20,7 +20,7 @@ id<GREYMatcher> contextMenuItemWithText(NSString* text);
 // for the menu item with |cancel_text| as its label.
 // On tablets, where the context menu is a popover, this will be a matcher for
 // some element outside of the popover.
-id<GREYMatcher> elementToDismissContextMenu(NSString* cancel_text);
+id<GREYMatcher> ElementToDismissContextMenu(NSString* cancel_text);
 
 }  // namespace testing