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The WebView will use a fixed default value for the text encoding instead
of getting it from the platform. This is in attempt to unify behavior
between devices.

BUG=422366

Review URL: https://codereview.chromium.org/639113004

Cr-Commit-Position: refs/heads/master@{#299287}

Conflicts:
	DEPS
	android_webview/buildbot/aosp_manifest.xml
	android_webview/renderer/aw_content_renderer_client.h
	chrome/renderer/chrome_content_renderer_client.h

Change-Id: I0b4f507e6e439561bf89e3a0e668910cbf0c9e08