[OSL-RV] Collapsing the Delegate into OmniboxSuggestionsDropdown

Moves OSDDelegate into OmniboxSuggestionsDropdown (patchset 1)
and flattens things out to a single class (patchset 2).

Bug: 1075602
Change-Id: I71322c03538879ba1bac587f24c590f28813e14e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530954Reviewed-by: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Filip Gorski <fgorski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827379}

chrome/android/chrome_java_sources.gni

@@ -1036,7 +1036,6 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionUiType.java",
   "java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionsDropdown.java",
   "java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionsDropdownAdapter.java",
-  "java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionsDropdownDelegate.java",
   "java/src/org/chromium/chrome/browser/omnibox/suggestions/OmniboxSuggestionsDropdownEmbedder.java",
   "java/src/org/chromium/chrome/browser/omnibox/suggestions/SuggestionCommonProperties.java",
   "java/src/org/chromium/chrome/browser/omnibox/suggestions/SuggestionHost.java",