Removed uses of IsRunningOnIOS9OrLater in crw_web_ or wk_web_view_

BUG=633626

Review-Url: https://codereview.chromium.org/2436903002
Cr-Commit-Position: refs/heads/master@{#427108}

ios/web/test/wk_web_view_crash_utils.mm

@@ -7,7 +7,6 @@
 #import <Foundation/Foundation.h>
 #import <WebKit/WebKit.h>
 
-#include "base/ios/ios_util.h"
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #include "ios/web/public/test/test_browser_state.h"
@@ -37,12 +36,10 @@ WKWebView* CreateMockWKWebViewWithStubbedJSEvalFunction(
 namespace web {
 
 void SimulateWKWebViewCrash(WKWebView* webView) {
-  if (base::ios::IsRunningOnIOS9OrLater()) {
   SEL selector = @selector(webViewWebContentProcessDidTerminate:);
   if ([webView.navigationDelegate respondsToSelector:selector]) {
     [webView.navigationDelegate performSelector:selector withObject:webView];
   }
-  }
   [webView performSelector:@selector(_processDidExit)];
 }
 

ios/web/web_state/crw_web_view_proxy_impl.mm

@@ -4,7 +4,6 @@
 
 #import "ios/web/web_state/crw_web_view_proxy_impl.h"
 
-#include "base/ios/ios_util.h"
 #include "base/mac/scoped_nsobject.h"
 #import "ios/web/public/web_state/crw_web_view_scroll_view_proxy.h"
 #import "ios/web/public/web_state/ui/crw_content_view.h"
@@ -169,16 +168,12 @@ UIView* GetFirstResponderSubview(UIView* view) {
   return firstResponder.inputAccessoryView;
 }
 
-#if defined(__IPHONE_9_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_9_0
 - (UITextInputAssistantItem*)inputAssistantItem {
-  DCHECK(base::ios::IsRunningOnIOS9OrLater())
-      << "Cannot retrieve inputAssistantItem on iOS versions earlier than 9.";
   if (!_contentView)
     return nil;
   UIView* firstResponder = GetFirstResponderSubview(_contentView);
   return firstResponder.inputAssistantItem;
 }
-#endif
 
 - (BOOL)becomeFirstResponder {
   return [_contentView becomeFirstResponder];

ios/web/web_state/ui/crw_web_controller.mm

@@ -5038,10 +5038,9 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
 - (void)webView:(WKWebView*)webView
     didStartProvisionalNavigation:(WKNavigation*)navigation {
   GURL webViewURL = net::GURLWithNSURL(webView.URL);
-  if (webViewURL.is_empty() && base::ios::IsRunningOnIOS9OrLater()) {
+  if (webViewURL.is_empty()) {
     // May happen on iOS9, however in didCommitNavigation: callback the URL
-    // will be "about:blank". TODO(eugenebut): File radar for this issue
-    // (crbug.com/523549).
+    // will be "about:blank".
     webViewURL = GURL(url::kAboutBlankURL);
   }
 

ios/web/web_state/ui/wk_web_view_configuration_provider.mm

@@ -58,8 +58,7 @@ WKWebViewConfigurationProvider::GetWebViewConfiguration() {
   DCHECK([NSThread isMainThread]);
   if (!configuration_) {
     configuration_.reset([[WKWebViewConfiguration alloc] init]);
-    if (is_off_the_record_ && base::ios::IsRunningOnIOS9OrLater()) {
-      // WKWebsiteDataStore is iOS9 only.
+    if (is_off_the_record_) {
       [configuration_
           setWebsiteDataStore:[WKWebsiteDataStore nonPersistentDataStore]];
     }