[COIL] Change chromium code search type links to use main rather than master for docs

    See this doc: go/chromium-coil-change for more info
    BUG=1210385

Change-Id: I6cd8548301e360bae8e71384dbd8ef11aa6c985f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2902904
Reviewed-by: My Nguyen <[email protected]>
Commit-Queue: My Nguyen <[email protected]>
Auto-Submit: John Palmer <[email protected]>
Cr-Commit-Position: refs/heads/master@{#885851}
diff --git a/docs/ios/multiwindow_eg_tests.md b/docs/ios/multiwindow_eg_tests.md
index e16fe46..3916e59 100644
--- a/docs/ios/multiwindow_eg_tests.md
+++ b/docs/ios/multiwindow_eg_tests.md
@@ -17,7 +17,7 @@
 unlikely case it is needed.  Depending on the needs of the test, you can decide
 on how to proceed, for example wanting to keep the left window as 0 and the
 right window as 1.  See
-[`[BrowserViewControllerTestCase testMultiWindowURLLoading]`](https://source.chromium.org/chromium/chromium/src/+/master:ios/chrome/browser/ui/browser_view/browser_view_controller_egtest.mm;l=209)
+[`[BrowserViewControllerTestCase testMultiWindowURLLoading]`](https://source.chromium.org/chromium/chromium/src/+/main:ios/chrome/browser/ui/browser_view/browser_view_controller_egtest.mm;l=209)
 as an example of this.
 
 ## Helpers
@@ -28,7 +28,7 @@
 parameter.
 
 The helpers all live in
-[ios/chrome/test/earl_grey/chrome_earl_grey.h](https://source.chromium.org/chromium/chromium/src/+/master:ios/chrome/test/earl_grey/chrome_earl_grey.h)
+[ios/chrome/test/earl_grey/chrome_earl_grey.h](https://source.chromium.org/chromium/chromium/src/+/main:ios/chrome/test/earl_grey/chrome_earl_grey.h)
 
 ### Window Management
 
@@ -182,7 +182,7 @@
 number to be specified. `WindowWithNumber` is useful as a root matcher and
 `MatchInWindowWithNumber` if you want to match without using a root matcher:
 
-[ios/chrome/test/earl_grey/chrome_matchers.h](https://source.chromium.org/chromium/chromium/src/+/master:ios/chrome/test/earl_grey/chrome_matchers.h)
+[ios/chrome/test/earl_grey/chrome_matchers.h](https://source.chromium.org/chromium/chromium/src/+/main:ios/chrome/test/earl_grey/chrome_matchers.h)
 
 ```
 // Matcher for a window with a given number.
@@ -215,7 +215,7 @@
 client-side-triggered actions that can be used, that work across multiple
 windows:
 
-[ios/chrome/test/earl_grey/chrome_xcui_actions.h](https://source.chromium.org/chromium/chromium/src/+/master:ios/chrome/test/earl_grey/chrome_xcui_actions.h)
+[ios/chrome/test/earl_grey/chrome_xcui_actions.h](https://source.chromium.org/chromium/chromium/src/+/main:ios/chrome/test/earl_grey/chrome_xcui_actions.h)
 
 ```
 // Action (XCUI, hence local) to long press a cell item with