Removing obsolete experimental flag

Bug: 
Change-Id: I845d5c0eaf79d6f932a7193b3742a00a797ed2c4
Reviewed-on: https://chromium-review.googlesource.com/598237Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491542}

ios/chrome/browser/about_flags.mm

@@ -168,15 +168,6 @@ void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {
     command_line->AppendSwitch(switches::kDisableOfflineAutoReload);
   }
 
-  // Populate command line flags from EnableFastWebScrollViewInsets.
-  NSString* enableFastWebScrollViewInsets =
-      [defaults stringForKey:@"EnableFastWebScrollViewInsets"];
-  if ([enableFastWebScrollViewInsets isEqualToString:@"Enabled"]) {
-    command_line->AppendSwitch(switches::kEnableIOSFastWebScrollViewInsets);
-  } else if ([enableFastWebScrollViewInsets isEqualToString:@"Disabled"]) {
-    command_line->AppendSwitch(switches::kDisableIOSFastWebScrollViewInsets);
-  }
-
   // Populate command line flags from ReaderModeEnabled.
   if ([defaults boolForKey:@"ReaderModeEnabled"]) {
     command_line->AppendSwitch(switches::kEnableReaderModeToolbarIcon);

ios/chrome/browser/chrome_switches.cc

@@ -15,10 +15,6 @@ namespace switches {
 // Disables Contextual Search.
 const char kDisableContextualSearch[] = "disable-contextual-search";
 
-// Disables a workaround for fast inset updates for UIWebView.scrollView.
-const char kDisableIOSFastWebScrollViewInsets[] =
-    "disable-fast-web-scroll-view-insets";
-
 // Lists separated by commas the name of features to disable.
 // See base::FeatureList::InitializeFromCommandLine for details.
 const char kDisableIOSFeatures[] = "disable-features";
@@ -57,10 +53,6 @@ const char kDisableThirdPartyKeyboardWorkaround[] =
 // Enables Contextual Search.
 const char kEnableContextualSearch[] = "enable-contextual-search";
 
-// Enables a workaround for fast inset updates for UIWebView.scrollView.
-const char kEnableIOSFastWebScrollViewInsets[] =
-    "enable-fast-web-scroll-view-insets";
-
 // Lists separated by commas the name of features to disable.
 // See base::FeatureList::InitializeFromCommandLine for details.
 const char kEnableIOSFeatures[] = "enable-features";

ios/chrome/browser/chrome_switches.h

@@ -10,7 +10,6 @@
 namespace switches {
 
 extern const char kDisableContextualSearch[];
-extern const char kDisableIOSFastWebScrollViewInsets[];
 extern const char kDisableIOSFeatures[];
 extern const char kDisableIOSPasswordGeneration[];
 extern const char kDisableIOSPasswordSuggestions[];
@@ -24,7 +23,6 @@ extern const char kDisableSlimNavigationManager[];
 extern const char kDisableThirdPartyKeyboardWorkaround[];
 
 extern const char kEnableContextualSearch[];
-extern const char kEnableIOSFastWebScrollViewInsets[];
 extern const char kEnableIOSFeatures[];
 extern const char kEnableIOSHandoffToOtherDevices[];
 extern const char kEnableIOSPasswordGeneration[];

ios/chrome/browser/resources/Settings.bundle/Experimental.plist

@@ -74,28 +74,6 @@
 			<key>DefaultValue</key>
 			<false/>
 		</dict>
-		<dict>
-			<key>Type</key>
-			<string>PSMultiValueSpecifier</string>
-			<key>Title</key>
-			<string>Enable Fast Web Scroll Insets</string>
-			<key>Key</key>
-			<string>EnableFastWebScrollViewInsets</string>
-			<key>DefaultValue</key>
-			<string></string>
-			<key>Values</key>
-			<array>
-				<string></string>
-				<string>Enabled</string>
-				<string>Disabled</string>
-			</array>
-			<key>Titles</key>
-			<array>
-				<string>Default</string>
-				<string>Enabled</string>
-				<string>Disabled</string>
-			</array>
-		</dict>
 		<dict>
 			<key>Type</key>
 			<string>PSToggleSwitchSpecifier</string>