Rename ShellEarlGreyAppInterface's loadURL: to startLoadingURL:.

loadURL: from other test helpers wait until load is finished.
startLoadingURL: name emphasizes that method returns without waiting.

Bug: 960407
Change-Id: I50a9f38cb30bece839279a9e46089fca6220af2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623626
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662062}

ios/web/shell/test/earl_grey/shell_earl_grey.mm

@@ -25,7 +25,7 @@ GREY_STUB_CLASS_IN_APP_MAIN_QUEUE(ShellEarlGreyAppInterface)
 
 - (void)loadURL:(const GURL&)URL {
   NSString* spec = base::SysUTF8ToNSString(URL.spec());
-  [ShellEarlGreyAppInterface loadURL:spec];
+  [ShellEarlGreyAppInterface startLoadingURL:spec];
 
   NSString* loadingErrorDescription = [NSString
       stringWithFormat:@"Current WebState did not finish loading %@ URL", spec];

ios/web/shell/test/earl_grey/shell_earl_grey_app_interface.h

@@ -16,7 +16,7 @@
 
 // Loads |URL| in the current WebState with transition of type
 // ui::PAGE_TRANSITION_TYPED and returns without waiting for the page to load.
-+ (void)loadURL:(NSString*)spec;
++ (void)startLoadingURL:(NSString*)spec;
 
 // Returns YES if the current WebState is loading.
 + (BOOL)isCurrentWebStateLoading WARN_UNUSED_RESULT;

ios/web/shell/test/earl_grey/shell_earl_grey_app_interface.mm

@@ -22,7 +22,7 @@ using web::shell_test_util::GetCurrentWebState;
 
 @implementation ShellEarlGreyAppInterface
 
-+ (void)loadURL:(NSString*)spec {
++ (void)startLoadingURL:(NSString*)spec {
   web::test::LoadUrl(GetCurrentWebState(), GURL(base::SysNSStringToUTF8(spec)));
 }